Please solve this . See below attachment

1.	Please solve this . See below attachment
Answer» Answer: Take FIRST 20 elements from HYDROGEN to calcium and make a model. Subatomic PARTICLES mean number of protons, electrons and neutrons. Valency of metals is same as of BALANCE electrons. For non metals subtract VALENCE electrons from 8.

Answer»

Answer:

Take FIRST 20 elements from HYDROGEN to calcium and make a model. Subatomic PARTICLES mean number of protons, electrons and neutrons. Valency of metals is same as of BALANCE electrons. For non metals subtract VALENCE electrons from 8.

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