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1. 1 Chemical Inter
Test your knowledge
Question | Answer |
---|---|
The nucleus of an atom contains . . . | protons and neutrons |
The atomic number of an element tells you the atom's | number of protons |
The most common element in the universe is | hydrogen |
Electrons... | move around outside the nucleus |
One kind of uranium atom has 92 protons and 143 neutrons. Another atom of uranium has 92 protons and 146 neutrons. The two uranium atoms are different... | isotopes |
Mg2+ is a magnesium ion that has | two fewer electrons than a neutral magnesium |