Compounds and Chemical reactions

Atoms of different elements have different numbers of protons.

• True

• False

Most of an atom is empty space.

• False

• True

To become more stable, an atom that has two electrons in its outer energy level will gain two electrons.

• False

• True

The particles that make up an atom are ____.

• electrons, protons, and nuclei

• protons, neutrons, and nuclei

• elements, protons, and electrons

• protons, neutrons, and electrons

Tags

NGSS.MS-PS1-1

The maximum number of electrons in the second energy level of an atom is ____.

• Two

• Four

• Eight

• Ten

In the compound, H2O, the electrons in the bonds are unequally shared between oxygen and hydrogen, forming ____.

• cations

• nonpolar molecules

• ionic bonds

• polar bonds

Alkali metals tend to lose one electron per atom in forming bonds. What family of elements will form ionic bonds with alkali metals, in a 2-to-1 ratio, alkali metal to other element?

• alkaline earth elements

• oxygen family

• halogens

• noble gases

Tags

NGSS.MS-PS1-5

What is the neutral particle that is formed when atoms share electrons?

• cation

• ionic compound

• molecule

• nucleus

Tags

NGSS.MS-PS1-1

In carbon dioxide, each oxygen atom shares four electrons with the carbon atom. What is this type of bond called?

• triple covalent

• double covalent

• polar covalent

• ionic

What is the group number for elements that have a stable number of electrons in their outer energy level?

• 18

• 17

• 2

• 1