Atoms: Structure & Mass yr 8

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

• cell

• molecule

• compound

• atom

What subatomic particle has a positive charge?

• Photon

• Proton

• Neutron

• Electron

Where are protons and neutrons located within an atom?

• Outer shell

• Nucleus

• Electron cloud

• Cytoplasm

What is the atomic number of an element?

• Integer

• Letter

• Decimal

• Boolean

How is the atomic mass of an element calculated?

• By counting the number of protons and neutrons in the nucleus

• By dividing the atomic number by the number of electrons

• By taking the weighted average of the masses of its isotopes, based on their abundance.

• By measuring the volume of the element

What is the charge of an electron?

• -1.6 x 10^-19 C

• -3.2 x 10^-19 C

• 0 C

• +1.6 x 10^-19 C

Tags

NGSS.MS-PS2-3

What is the total number of protons in the nucleus of an atom?

• Neutron number

• Electron number

• Mass number

• Atomic number

What is the mass number of an element?

• Total number of protons + total number of neutrons

• Total number of electrons + protons

• Total number of electrons

• Total number of isotopes

• Total number of protons

What is the symbol used to represent an atom of a specific element?

• Atomic symbol

• Chemical symbol

• Molecular symbol

• Elemental symbol

How many electrons can the first energy level of an atom hold?

• 8

• 4

• 2

• 6