Periodic Table and Counting atoms

Front

A ___________ is an arrangement of elements in columns.

Back

periodic table

Front

In the modern periodic table, elements are arranged by: atomic mass, atomic number, valence electrons, number of isotopes

Back

atomic number

Front

Each row in the periodic table is called a 

Back

period

Front

Elements with properties that fall between those of metals and nonmetals

Back

metalloids

Front

Element with 2 valence electrons and 3 energy levels. Options: 1, 2, 3, 4

Back

1

Front

Which pair of properties describe the elements in group 18?

Back

They are gases at room temperature and are stable.

Front

Which two elements on the periodic table are in the same group? Options: Na and He, O and C, Li and Ne, He and Ar

Back

He and Ar

Front

Which pair of properties describes the elements in Group 1?

Back

They are the most reactive metals

Front

How many valence electrons are in an element in group 15 in the periodic table?

Back

5

Front

Which two atoms are elements in the same group in the periodic table? Options: Atom 3 and Atom 4, Atom 1 and Atom 4, Atom 3 and Atom 2, Atom 1 and Atom 2

Back

Atom 1 and Atom 4