Atomic Structure & Periodic Table

What is an atomic number?

• Number of protons in an atoms 
• Number of neutrons in an atom
• Mass of an atom
• Charge on an atom

Which subatomic particles are found in the nucleus of an atom?

• Protons and Electrons
• Protons and Neutrons
• Neutrons and Electrons
• Protons, Neutrons and Electrons

What electrical charge does a proton have?

• +1
• 0
• -1
• +2

What mass does a neutron have?

• 1 amu

• 0 amu

• -1 amu

• +2 amu

Tags

NGSS.HS-PS1-8

The total number of protons and neutrons in an atom is called the...

• Atomic number
• Proton number
• Mass number
• Weight number

How many protons does an aluminum atom have? Hint: You will need to look at the periodic table.

• 27

• 14

• 40

• 13

How many electrons does a sodium atom have? Hint: You will need to look at a periodic table.

• 23

• 11

• 12

• 34

Tags

NGSS.MS-PS1-1

Atoms of the same element must always have the same number of _________

• electrons
• neutrons
• isotopes
• protons

In a chemically neutral atom, the number of protons always equals the number of _____________.

• neutrons

• orbitals

• electrons

• isotopes

The mass number of an element that has 18 protons, 18 electrons, and 19 neutrons is _____.

• 12.5

• 13

• 25

• 37

Answer explanation

Mass number is always the # of protons + the # of neutrons.