Generally, the top elements in group 16 will have a charge of -2, although the entire group isn't standardized.
The correct answer is A: Formed by the sharing of valance electrons between atoms.
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Helium (He)
Explanation:
In the picture we see the following elementary particles:
2 electrons - the two spheres with negative charge which orbit around the nucleus
2 protons - the two spheres with positive charge in the nucleus
2 neutrons - the two spheres with no charge in the nucleus
The element will be Helium (He), because it have the atomic number 2 and the mass number 4, which means it contains 2 electrons, 2 protons and 2 neutrons.
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If electrons are negative, losing an electron makes the ion positive.
Therefore Cu1+ contains 1 unpaired electron.
The answer is 3. As 5 * 3 = 15.
Is there any other equations I may be able to help you with? :)
