Một nguyên tử của nguyên tố X có tổng số hạt proton, neutron, electron là 52 và có số khối là 35. Số hiệu nguyên tử của nguyên tố X là
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
Gọi P, N, E lần lượt là số proton, neutron và electron của X
Tổng số hạt trong nguyên tử nguyên tố X là 52
→ P + N + E = 52 (1)
số khối của X là 35
→ P + N = 35 (2)
Mà P = E (3)
Từ (1), (2) và (3), giải hệ phương trình => P = E = 17 và N = 18
-> Z = P = 17
Đáp án C
Bộ Đề Kiểm Tra Giữa Học Kì I - Hoá Học 10 - Kết Nối Tri Thức Với Cuộc Sống giúp các em học sinh kiểm tra toàn diện các kiến thức quan trọng qua 40 câu trắc nghiệm. Từ đó, các em học sinh sẽ nắm vững lý thuyết và thực hành nhuần nhuyễn để giải quyết nhanh các dạng bài và đạt kết quả cao.
Câu hỏi liên quan
Nguyễn Tuân từng giữ chức vụ nào sau đây?
Giá trị của biểu thức \(P=\sin x+x\) với \(x=390{}^\circ \) là?
Đặc điểm nào dưới đây đúng về trị trí địa lí nước ta?
Ý nào sau đây không nói về đặc điểm kế hoạch tài chính cá nhân dài hạn?
Tìm m để hàm số y = xác định trên khoảng (0; 5)?
Read the following passage about The Key to a Fulfilling Life and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 18 to 22.
In today's fast-paced world, the importance of maintaining a healthy lifestyle cannot be overstated. (18)_________. For instance, those who engage in physical activities regularly often experience increased energy levels and improved mental well-being.
Moreover, research shows that (19)_________. Healthy habits, such as drinking plenty of water and getting enough sleep, contribute significantly to overall wellness.
(20)_________. It is essential to find activities that you genuinely enjoy, as this will make it easier to stay committed.
For example, many people find that yoga helps them manage stress while improving their flexibility. (21)_________. (22)_________.
In conclusion, making small changes to your daily routine can lead to significant improvements in your health and happiness. Embracing a healthy lifestyle is not just a trend; it’s a lifelong commitment to yourself.
Cho hình chóp S.ABCD có đáy là hình chữ nhật tâm \(O,AB=a,BC=a\sqrt{3}\), chân đường cao hình chóp là điểm \(H\) thuộc cạnh AD sao cho \(DH=2AH\), góc giữa SD và mặt phẳng đáy bằng \({{60}^{{}^\circ }}\). Khoảng cách giữa hai đường thẳng SB và AC bằng bao nhiêu?
Read of the following leaflet and mark the letter A, B, C or D on your answer sheet to indicate the option that best fits each of the numbered blanks from 7 to 12.
Beyond Success: The Human Stories Behind Great Achievements
The Journey Behind Every Triumph
While some people focus only on achievements, (7)_________ understand that the path to success is filled with challenges and growth opportunities.
Great innovators often (8)_________ their mentors who guided them through difficult times. The resilience shown by successful people becomes their greatest strength in times of adversity. (9)_________ numerous failures, many accomplished individuals persevered until they reached their goals. Their determination and perseverance serve as (10)_________ for aspiring achievers worldwide. A (11)_________ of successful people attribute their achievements to the support of their families and friends.
Behind Every Success Story
Success is never just about the final achievement. It's about the human journey—the struggles, doubts, failures, and moments of (12)_________ that shape not just careers but character. Join us as we explore the personal stories behind some of the most remarkable achievements of our time.
Chuyển động của Trái Đất quanh Mặt Trời có thể xem như là chuyển động tròn đều vì
Người lao động làm việc trong ngành nghề của trồng trọt cần đảm bảo mấy yêu cầu cơ bản?
Chọn ý đúng nhất: Lợi ích đem lại của việc sử dụng phân bón hợp lí là gì?
Người tiêu dùng mong điều nào sau đây xảy ra?
Mark the letter A, B, C, or D on your answer sheet to indicate the best arrangement of utterances or sentences to make a meaningful exchange or text in each of the following questions from 13 to 17
a. Engaging in hobbies and personal interests can have a profound impact on overall well-being.
b. These activities provide a much-needed break from the routine of daily life.
c. Dear Sam, I've been reflecting on our discussion about balancing work and personal life.
d. Hobbies also allow for personal growth and skill development.
e. Gardening, painting, or playing a musical instrument can foster creativity and boost self-esteem.
Đơn phân cấu tạo nên nucleic acid có
Ý nào sau đây là thể hiện vai trò của tín dụng?
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct option that best fits each of the numbered blanks from 24 to 28.
Coincident with concerns about the accelerating loss of species and habitats has been a growing appreciation of the importance of biological diversity, the (24) _______ of species in a particular ecosystem, to the health of the Earth and human well-being. Much has been written about the diversity of terrestrial organisms, particularly the exceptionally rich life associated tropical rainforest habitats. Relatively little has been said, (25) _______ , about the diversity of life in the sea even though coral reef systems are comparable to rain forest in terms of richness of life.
An alien exploring Earth would probably (26) _______ priority to the planet's dominants – most distinctive feature - the ocean. Humans have a bias toward land (27) _______ sometimes gets in the way of truly examining global issues. Seen from far away, it is easy to realize that landmasses occupy only one-third of the Earth's surface. Given that two thirds of the Earth's surface is water and that marine life lives at all levels of the ocean, the total three-dimensional living space of the ocean is perhaps 100 times (28) _______ than that of land and contains more than 90 percent of all life on Earth even though the ocean has fewer distinct species.
Xác định một từ/ cụm từ SAI về ngữ pháp/ hoặc ngữ nghĩa/ logic/ phong cách.
Dù viết về phong tục hay con người, trong tác phẩm của Kim Lân, ta vẫn thấy thấp thoáng cuộc sống con người của làng quê Việt Nam nghèo khổ, thiếu thốn mà vẫn yêu đời, thật thà chất phác mà rủng rỉnh, hóm hỉnh.
Read the following passage about the Second Acts That Inspire and mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions from 31 to 40.
Life often presents us with unexpected challenges that force us back to the drawing board. Whether due to personal setbacks, career changes, or unforeseen circumstances, the courage to begin again can lead to remarkable transformations. Many inspiring individuals have shown that it's never too late to reinvent oneself and pursue new dreams. Throughout history, countless people have overcome seemingly impossible situations through sheer determination.
[I] Take J.K. Rowling, for instance. Before becoming a literary sensation, she was a struggling single mother living on welfare. [II] Her determination eventually paid off when her books became a global phenomenon, proving that setbacks can become stepping stones to success. [III] This remarkable turnaround demonstrates how resilience and unwavering belief in oneself can overcome seemingly insurmountable obstacles. Despite facing depression and financial hardship, she never gave up on her dreams. [IV]
Colonel Harland Sanders' story is another testament to the power of starting anew. At the age of 65, when most people contemplate retirement, he found himself struggling financially after his restaurant failed. Instead of giving up, he traveled across America, sleeping in his car while pitching his chicken recipe to restaurant owners. His recipe for success wasn't just about the perfect blend of herbs and spices; it was about persistence and determination. After facing over 1,000 rejections, he finally established Kentucky Fried Chicken, which grew into a global empire. His unwavering spirit and dedication inspired generations of entrepreneurs worldwide.
These inspiring stories remind us that failure is not final, but rather a chance to redirect our path. Every setback carries the seed of an equal or greater opportunity, and sometimes the end of one chapter is simply the beginning of a better one. The key lies in having the courage to take that first step, even when the future seems uncertain. As these remarkable individuals have shown, it's never too late to rewrite your story and create a powerful second act. Their journeys teach us that persistence and courage ultimately lead to success.
Based on the passage, which of the following is NOT MENTIONED?
Xác định ý đúng: Thương mại được cho là khâu nối giữa sản xuất với tiêu dùng thông qua?
Chọn ý đúng: Các quốc gia nào sau đây là quốc gia nhập siêu?