Atoms and the Periodic Table

Group 18, the noble gases, are inert because

Which element is an alkali metal?

Who suggested that the universe was made of invisible units called atoms?

A noble gas with 4 energy levels

Atoms of elements that are in the same group have the same number of

The number of electrons that each energy level can hold is

If the mass number of Ar is 40, how many neutrons does it have?

Atoms of elements that are in the same period have the same number of

What is the symbol for sulfur?

Isotopes are different versions of the same element. What subatomic particle is different?

Which two subatomic particles contain the mass of the atom?

Magnesium and calcium are both

A halogen

Positively charged particle in the atom

According to Bohr's model of the atom, electrons behave like

What element is represented by the symbol Cl?

What is the charge on the nucleus?

The mass number tells you

The number of valence electrons an element has corresponds to the

The number of energy levels an element has corresponds to the

The order of the elements on the periodic table is based on

N-13 This symbol represents

What does the atomic number tell you?

Valence electrons are

Negatively charged particle in the atom

An element that is a very reactive gas is most likely a member of the

A nonmetal on the metal side

Oxygen's atomic number is 8. This means that an oxygen atom has

Carbon and other nonmetals are found in which area of the periodic table?

What is the symbol for Argon?