Physical Science Unit 2 Vocab

What is the smallest unit of an element that retains the properties of that element?

• Molecule

• Atom

• Compound

• Ion

Which subatomic particle has a positive charge?

• Electron

• Neutron

• Proton

• Quark

What is the term for the number of protons in the nucleus of an atom?

• Mass number

• Atomic number

• Isotope

• Valence electrons

Which particles are found in the nucleus of an atom?

• Electrons and protons

• Neutrons and electrons

• Protons and neutrons

• Quarks and electrons

What is the term for atoms of the same element with different numbers of neutrons?

• Ions

• Isotopes

• Molecules

• Compounds

What is the average mass of all the isotopes of an element called?

• Atomic number

• Mass number

• Average atomic mass

• Valence electrons

What is the term for the outermost electrons of an atom?

• Core electrons

• Valence electrons

• Neutrons

• Protons

What is a substance made of two or more elements chemically combined in a fixed ratio?

• Mixture

• Element

• Compound

• Solution

What is the rule that states atoms tend to gain, lose, or share electrons to have eight electrons in their outer shell?

• Duet rule

• Octet rule

• Triple rule

• Quadruple rule

What is the term for a bond formed by the sharing of electrons between atoms?

• Ionic bond

• Covalent bond

• Metallic bond

• Hydrogen bond