Atoms and Periodic Table

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

• Particles

• Atoms

• Protons

Tags

NGSS.MS-PS1-1

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

• Democritus

• Dalton

• Jefferson

Who proposed the atomic theory in 1808, which states that different elements form compounds

• 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

What are the elements called in Groups 3-12 of the periodic table?

• Alkai Metals

• Transitional Metals

• Noble Gases

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

• Proton

• Neutron

• Electon

Electron in the outermost energy level are called?

• Valence Electron

• Valence Proton

• Valence Neutron

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

__________ are Group 1 metals and are soft and react with water

• Alkai Metals

• Transitional Metals

• Noble Gases

Tags

NGSS.HS-PS1-2

The majority of the elements in the periodic table are

• Non-Metals

• Metals

• Metalloids

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

• Period

• Group