Spence8900

30.09.2021 • 

Physics

The main-group elements are the forty-four elements that occupy groups 1A-VIIA of the periodic table. Main-group elements are important because of their high natural abundance both in the Earth's crust and in the human body and are commercially valuable. Review the families containing main group elements and locate families IVA - VIIA. When forming chemical compounds, these four families have commonalities. Explain using as many answer choices that would apply. A)When forming compounds they become positive ions.
B)As nonmetals, they have high electron affinities.
C)These elements form covalent bonds when combining with metals.
D)They gain or share electrons when they react with other elements.EliminateD)When forming compounds, they obey the octet rule to have eight outer electrons.

Ответ:

15krystall

11.05.2023

Physics

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The Earth is a rotating sphere that orbits the Sun. The axis of rotation of the Earth is at a constant tilt with respect to its orbit around the Sun, thus resulting in the change of seasons. Iron and oxygen make up 65% of the Earth's mass. The Earth also has gravity and magnetic force fields.

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