Physics, asked by fahadmanzoor1180, 7 months ago

how many elements are there in first period and what are their names and symbols​

Answers

Answered by Anonymous
3

Answer:

A new period begins when a new principal energy level begins filling with electrons. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements. Periods 4 and 5 have 18 elements.

Hope it helps uhh ❤

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