Science, asked by Anonymous, 7 months ago

one word :
1. when an element has more than one valency....
2.the sum of protons and neutrons present in the nucleus of an atom​

Answers

Answered by bushrafatimahafeez
2

Answer:

1. "variable valency "

2. mass no.

Answered by aloksingh17801980
1

Answer:

variable valency and mass no....

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