Science, asked by Anonymous, 10 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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