Cho một nguyên tử X có tổng số hạt p,n,e là 10 hạt và số khối 7.Số hiệu nguyên tử của nguyên tố X là bao nhiêu

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Đáp án:

\(\left\{ \matrix{

2p + n = 10 \hfill \cr

p + n = 7 \hfill \cr} \right. \Rightarrow \left\{ \matrix{

p = 3 \hfill \cr

n = 4 \hfill \cr} \right.\)

có p = 3 => số hiệu nguyên tử Z = p = 3

Đáp án:

Z = 3

Giải thích các bước giải:

- Tổng hạt: 2Z + N = 10 (1)

- Số khối: A = Z + N = 7 (2)

Giải hệ được Z = 3 và N = 4

Vậy số hiệu nguyên tử của X là Z = 3

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