Periodic Table

Oxygen has an atomic number of 8. What can you conclude from this fact?

• An atom of oxygen weighs 8 grams.

• An atom of oxygen has 4 protons and 4 electrons.

• An atom of oxygen has 8 positrons.

• An atom of oxygen has 8 protons.

Tags

NGSS.MS-PS1-1

In the following diagram, what does the number 12 represent?

• An atomic number

• A number of electrons

• An atomic mass

• A chemical symbol

The chemical symbol "Ni" most likely represents:

• Carbon

• Antimony

• Lead

• Nickel

How many protons are in this element?

• 79

• 196

• 117

• Cannot be determined

Tags

NGSS.MS-PS1-1

How did Mendeleev arrange the elements?

• alphabetical 

• density

• melting point

• atomic mass

The horizontal row on the periodic table is called a

• group

• family

• period

• atomic number

Each column in the periodic table is called a 

• period

• group

• cluster

• unit

The atoms along the staircase are called 

• metals

• nonmetals

• metalloids

• noble gases

What's a valence electron?

• electrons in the second energy level

• electrons in the outermost energy level

• the atomic number

• electrons in the first level

one or two letters that represent the name of an element

• element name

• element symbol

• atomic number

• atomic mass