How many electrons does a neutral atom of potassium have?

How many electrons does a neutral atom of bromine have?

How many protons and electrons does an ion of Ca+2?

How many protons and electrons does an ion of S-34?

How many protons and electrons does an ion of Na+1?

How many electrons does a neutral atom of uranium have?

Which symbols represent atoms that are isotopes?

Which atom contains exactly 15 protons?

Almost the entire mass of an atom is concentrated in the _____.

The nucleus of an atom has all of the following characteristics EXCEPT that it

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