Atoms & The Periodic Table

__________ are the smallest unit of an element that maintains the properties of the element.

• Particles

• Atoms

• Protons

• Molecules

What Greek philosopher suggested that the universe was made of invisible units called "atomos"

• Democritus

• Dalton

• Jefferson

A nucleus of an atom contains what two parts?

• Electrons and Protons

• Neutrons and Electrons

• Protons and Neutrons

Tags

NGSS.HS-PS1-8

Isotopes of an element have different number of ___________ and therefore have different masses.

• Proton

• Neutron

• Electon

Electrons in the outermost energy level are called?

• Valence Electron

• Valence Proton

• Valence Neutron

Elements in the same _________ have the same number of valence electrons.

• Period

• Group

If an atom has an atomic mass of 11 and contains 5 electrons, its atomic number would be______

• 11

• 5

• 6

Tags

NGSS.MS-PS1-1

The atomic number of an element is the number of _______ it has.

• protons

• neutrons

• electrons

• protons and neutrons

Tags

NGSS.MS-PS1-1

The periodic table is organized into columns called _______ and rows called ______.

• groups and periods

• periods and groups

• categories and periods

• categories and groups

An atoms nucleus has a _________ charge.

• positive

• negative

• neutral

• non

Tags

NGSS.MS-PS1-1