Which is a characteristic of the part of the atom marked
"A"?
A
It contains most of the mass.
It is negatively charged.
It is mostly empty space.
It is composed of electrons.
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The correct answer is "It contains most of the mass".

Explanation:

The part of the atom marked "A" belongs to the nucleus. The nucleus contains most of the mass of the atom, since the other part of the atom belongs to the electron and the mass of the electron represents only 1/1836 of the mass of the lightest nucleus. The nucleus of the atom is positive, since it is comprised of protons and neutrons, which are positive and neutral, respectively. The exception is the hydrogen's nucleus that is comprised of only one proton, but is positive as well. I attached the missing figure.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but