Atoms, Elements & the Periodic Table

The atomic number of an atom identifies the number of ____ in an atom.

• protons

• neutrons

• electrons

• protons and neutrons

How many electrons are in an atom that 12 protons and 13 neutrons?

• 1

• 12

• 13

• 25

The nucleus of an atom contains

• electrons only.

• electrons and neutrons.

• protons only.

• protons and neutrons.

If an ion (charged atom) contain 3 protons, 4 neutrons and 2 electrons, what is the mass number of the atom?

• 3

• 4

• 7

• 9

The vertical columns in the periodic table are called

• groups or families.

• transition groups.

• columns.

• periods.

The horizontal rows in the periodic table are called

• groups.

• families.

• periods.

• transition groups.

The number of neutrons in an atom can be determined by taking

• atomic number minus atomic mass number

• atomic mass number minus isotope number

• atomic mass number minus atomic number

• electron number minus atomic number

The periodic table shows that Selenium has 34 protons. This means that a selenium atom also has

• 34 neutrons.

• 34 electrons.

• an atomic number of 17.

• more electrons than protons.

Tags

NGSS.MS-PS1-1

Metals are located on the _______ of the periodic table.

• staircase line

• left side

• right side

• top 3 rows

Nonmetals are located on the _____ of the periodic table.

• right side

• left side

• bottom 4 rows

• staircase line