Modern periodic table

Each column in the periodic table is called a 

• period
• group
• cluster
• unit

Which group of the periodic table is composed of inert (not reactive)  gases?

• alkali metals
• alkaline earth metals
• halogens
• noble gases

A horizontal row of elements in the periodic table.

• column
• group
• period

Elements in a ..................have similar chemical properties.  

• period
• group
• row

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

The number of valence shell electrons increases across the...

• group

• period

• cluster

• periodic table

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following elements is an alkali metal?

• calcium

• magnesium

• mercury

• sodium

In Mendeleev's periodic table, elements in each column had similar

• atomic masses.

• properties.

• atomic numbers.

• symbols.

How was Mendeleev's periodic table arranged?

• by increasing atomic mass

• by decreasing atomic mass

• by increasing atomic number

• by decreasing atomic number

Mendeleev left gaps in his periodic table because

• the table was too small.

• protons belonged there.

• the table was too full.

• no known elements fit there.