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stepan [7]
2 years ago
6

Pls help and i will mark brainliest

Chemistry
2 answers:
myrzilka [38]2 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 .

<em>That</em><em>'</em><em>s</em><em> </em><em>all</em><em> </em><em>i</em><em> </em><em>dont</em><em> </em><em>know</em><em> </em><em>if</em><em> </em><em>this</em><em> </em><em>is</em><em> </em><em>right</em><em> </em><em>though</em><em>.</em><em> </em>

Serjik [45]2 years ago
5 0
Sodium
Beryllium
Lithium
Helium
Potassium
Fluorine
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Learn more about:

density

brainly.com/question/952755

brainly.com/question/6838128

#learnwithBrainly

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