When looking down the groups the elements have an equal number of electrons in the outer shell. This means they react in a similar way making it easier for scientists to use.
A- water. It’s the only one that isn’t a gas
Answer:
20.0928.
Explanation:
The average atomic mass is (90 * 19.992 + 10* 21) / 100
= 20.0928.
Answer:4 pairs of electrons
Explanation: SiCl4 is a tetrahedral because it has four pairs of electrons.
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