This is a chemical element. You can find the how many electron in a single atom by using a Periodic Table.
Calcium has two valence electrons, so it would have two electron dots in a Lewis electron dot diagram.
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There should be 3 dots in the electron dot diagram of a boron (B) atom, as boron has 3 electrons. Each dot represents one valence electron.
However many valence electrons there are, which I believe is 3
Zinc is an electron donor; by giving away two electrons, it becomes Zn2+.
Arsenic should have 5 electron dots in its Lewis structure, one for each valence electron.
Calcium has two valence electrons, so it would have two electron dots in a Lewis electron dot diagram.
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In the electron dot diagram for calcium, there are two dots shown, as calcium has two valence electrons.
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There should be 3 dots in the electron dot diagram of a boron (B) atom, as boron has 3 electrons. Each dot represents one valence electron.
There is two dots above the Mn, there your two S dots
dots in an electron shell
However many valence electrons there are, which I believe is 3
Zinc is an electron donor; by giving away two electrons, it becomes Zn2+.