Chemistry 8

What is the basic unit of a chemical element?

• Compound

• Molecule

• Atom

• Element

What is the atomic number of an element?

• It is the number of electrons in an atom.

• It is the number of protons in the nucleus of an atom.

• It is the sum of protons and neutrons in an atom.

• It is the number of electrons in the outermost shell of an atom.

How are the elements organized in the periodic table?

• By increasing atomic number

• Alphabetically

• By chronological discovery

• By decreasing atomic mass

What information does the chemical symbol of an element provide us?

• Indicates the number of electrons in the valence shell of the element

• Provides information about the atomic identity of the element, including its atomic number and unique abbreviation.

• Describes the density of the element in its solid state

• Provides information about the melting temperature of the element

What is the number of protons in a hydrogen atom?

• 3

• 2

• 4

• 1

What does the atomic number of an element represent?

• The weight of the atom in grams

• The amount of neutrons in an atom

• The number of electrons in an atom

• The amount of protons in the nucleus of an atom.

What is the first element in the periodic table?

• Hydrogen

• Oxygen

• Carbon

• Helium

What is the chemical symbol for oxygen?

• Oxygen

• C

• N

• H

How many electrons does a sodium atom have in its outer shell?

• 4

• 2

• 3

• 1

What property increases gradually as you move from left to right in the periodic table?

• Atomic mass

• Atomic radius

• Atomic number

• Electronegativity