Atomic Structure and the Periodic Table

Front

What is the horizontal row on the periodic table called?

Back

A period; elements in a period have the same number of energy levels.

Front

Why are fluorine (F), chlorine (Cl), bromine (Br), and iodine (I) grouped together in the periodic table?

Back

They are all very reactive nonmetals that have similar chemical properties.

Front

In what order should the regions of the periodic table be arranged from left to right?

Back

Metals, metalloids, nonmetals, noble gases.

Front

What are the electrons on the outermost shell of an atom called?

Back

Valence electrons.

Front

How many protons are in a neutral atom of zirconium with an atomic number of 40?

Back

40 protons.

Front

What is the definition of an atom?

Back

The smallest unit of an element that retains the properties of that element.

Front

What is the atomic number of an element?

Back

The number of protons in the nucleus of an atom.

Front

What are groups or families in the periodic table?

Back

Vertical columns where elements have similar chemical properties.

Front

What are noble gases?

Back

Elements in group 18 of the periodic table that are mostly nonreactive.

Front

What is the significance of valence electrons?

Back

They determine how an atom can bond with other atoms.