Ch 2 Vocabulary Review

Outermost shell of an atom

• valence shell

• orbital

• electron shell

• nucleus

H2O is a compound because it

• is made of 2 or more atoms

• is made of 2 or more atoms of different elements

• is composed of 2 of the same element

• has a full valence shell

The 4 elements that make up your body's mass are:

• oxygen

  nitrogen

  carbon

  hydrogen

• hydrogen

  oxygen

  water

  carbon

• hydrogen

  oxygen

  iron

  carbon

• nitrogen

  magnesium

  oxygen

  carbon

The atomic nucleus contains

• electrons

• electrons and protons

• protons and neutrons

• electrons, protons, and electrons

The atomic number tells the number of ____ in the atom.

• electrons

• protons

• neutrons

• shells

Atoms that have the same number of protons but a different number of neutrons is called

• chemical bonds

• elements

• ions

• isotopes

Valence electrons are found

• in the nucleus

• in the first layer of the atom

• in the outer shell of the atom

• in all shells of the atom

When atoms share a pair of electrons they form

• an ion

• an isotope

• an ionic bond

• a covalent bond

When electrons transfer from one atom to another they will be held together by

• a covalent bond

• an ionic bond

• hydrogen bond

• Van der Waals interaction

Larger atoms that need less electrons to fill their shells pull stronger on the electrons being shared. This is called having a higher _______.

• atomic mass

• number of shells

• electronegativity

• atomic number