The vertical columns on the periodic table are called groups or families<span> because of their similar chemical behavior. All the members of a </span>family<span> of </span>elements<span> have the</span>same<span> number of valence electrons and similar chemical properties</span>
It would be solid
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The atomic mass would not change since the mass of an electron is negligible compared to the mass of protons and neutrons
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composed of two or more parts, elements, or ingredients:
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Surfactant. Surfactant, also called surface-active agent, substance such as a detergent that, when added to a liquid, reduces its surface tension, thereby increasing its spreading and wetting properties
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