Atoms, Elements and Periodic Table

Where are the most reactive metals located on the periodic table?

• the uppermost complete row of the table

• the rows at the bottom of the table connecting two section

• the column at the far left side of the table

• the second column from the right side of the table

Elements in the same column of the periodic table of the elements all

• have the same number of protons.

• share the same atomic structure.

• have similar physical characteristics.

• share the same number of neutrons.

According to the periodic table, argon is found in what column?

• 1 (1A)

• 2 (2A)

• 16 (6A)

• 18 (8A)

What is the smallest unit of an element that still retains the element’s properties?

• proton

• crystal

• atom

• molecule

Label the parts of the periodic table​

a

b

c

Metals

Nonmetals

Metalloids

What do we call the vertical columns on the periodic table?

• Periods

• Groups

Answer explanation

The horizontal rows on the periodic table are called periods. Each period represents a different energy level of electrons in the atoms of the elements in that row.

What do we call the horizontal rows on the periodic table?

• Periods

• Groups

Answer explanation

The horizontal rows on the periodic table are called periods. Each period represents a different energy level of electrons in the atoms of the elements in that row.

Match the correct parts of the periods table

• Yellow (Right)

• Metals

• Blue (left)

• Groups

• Red (middle)

• Nonmetals

• Rows 1-7

• Periods

• Columns 1-18

• Metalloids

Which statement BEST describes an atom with an atomic number of 20?

• The atom has 20 protons.

• The atom has 20 neutrons.

• The sum of the number of protons and electrons is 20.

• The sum of the number of protons and neutrons is 20.

Elements are identified by their atomic number because

• the mass of an element changes over time.

• the number of protons remains constant.

• atoms of the same element have different numbers of neutrons.

• elements in a group react in a similar way.