Pls help and i will mark brainliest

Chemistry

2 answers:

myrzilka [38]3 years ago

6 0

Answer:

No. 3 lithium

Explain that lithium has 3 protons and 3 electrons. There are 2 electrons on the first energy level and 1 electron on the second

No. 4 Hydrogen (H) and helium (He) have a valence shell containing one and two electrons respectively. They make up the first period (row) of the periodic table. Their valence electron/s are in the first energy level (n=1) , as is denoted by 1s1 and 1s2 .

That's all i dont know if this is right though. 

Serjik [45]3 years ago

5 0

Sodium
Beryllium
Lithium
Helium
Potassium
Fluorine

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