核的质子数为________,中子数为________,质量数为________,核电荷数为

核的质子数为________,中子数为________,质量数为________,核电荷数为________.写出核电荷数是7、中子数是7的原子核的符号________.

答案

解析:原子核符号中X为元素符号,A为原子核的质量数,Z为原子核中的质子数,中子数等于质量数减质子数.对原子而言,质子数等于核电荷数,等于核外电子数,并代表元素的原子序数.

答案:86  136  222  86 

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