Question

1.
Hydrogen

Phase: _____________

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Answer 1

Answer:

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Hydrogen is the chemical element with the symbol H and atomic number 1. It has a standard atomic weight of 1.008, meaning it is the lightest element in the periodic table. ... Hydrogen's most common isotope has one proton with one electron orbiting around it.

Explanation:

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Answer 2

Answer:

hydrogen symbol=H

common isotope

valency=1

it has one proton and 1 electron