Atoms, Periodic Table, Cells

What is the atomic number?

• number of protons
• number of neutrons
• number of electrons
•  number of protons and neutrons

What is the mass number?

• the number of protons
• the sum of the number of protons and the number of neutrons in the nucleus of an atom 
• number of neutrons
• number of electrons

Tags

NGSS.HS-PS1-8

an electron has this charge

• positive
• negative
• neutral

a neutron has this charge

• negative
• positive
• neutral

a proton has this charge

• negative
• positive
• neutral

An element is composed of how many types of atoms?

• 5
• 3
• 1

vertical columns in the periodic table are _________ of elements with similar properties. 

• groups
• periods

_______ are horizontal  rows of elements that contain increasing numbers of protons and electrons.

• groups
• periods

What is an electron dot diagram (same as Lewis Dot diagram)?

• use the element symbol and dots to represent OUTER energy level electrons.
• Use the element symbol and dots to represent INNER energy level electrons.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Elements that have properties of both metals and nonmetals are _____

• metals
• metalloids
• nonmetals