假如我是一朵白云,我会飘到草原上,去看成群的牛羊;

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阅读短文，下列问题

Why do children like watching TV?

       Many children like watching TV. It's very interesting and they can see a lot and know many things about other people. They can learn from the radio, too. But they can learn easily from TV. Why? Because they can hear and watch at the same time. But they can't watch anything from the radio.

    TV helps to open children's mind. They can find better way to do things.

    Many children watch TV only on Saturday and Sunday evenings.They are very busy. But some children watch TV every night. They go to bed late. It's not good for their eyes and health.

近日，某省发现部分大米镉超标，镉超标易引起镉中毒．镉元素的核电荷数为48 ，相对原子质量为112 ，则镉原子的核外电子数是（   ）.