Chemistry Year Review

What does the 6 represent?

• atomic mass

• atomic number

• element name

• chemical symbol 

Tags

NGSS.MS-PS1-1

What does 12.011 represent?

• atomic mass

• atomic number

• element name

• chemical symbol 

When sodium metal (Na) reacts with water (H2O), hydrogen gas (H2) is released. What ions would remain in the solution?

• Na+

• H+

• Na+ and OH-

• H+ and O2-

Tags

NGSS.MS-PS1-2

The atomic number of an element is found

• at the top of an element's box on the periodic table

• at the bottom of an element's box on the periodic table

• not on the periodic table

• calculated by adding the protons and neutrons of an atom

What is true about a neutral atom?

• The number of protons equal the number of neutrons

• The number of protons equal the number of electrons

• The number of neutrons equal the number of electrons

• The number of protons, neutrons, and electrons are all different

The modern periodic table is organized with the elements in order of _________ atomic number.

• increasing

• decreasing

The period number tells ____.

• atomic number

• the number of electron shells

• the number of valence electrons

• the number of protons

The group number tells ______.

•  number of atoms

• number of valence electrons

• number of protons

• number of energy levels

Which subatomic particles make up the mass of an atom?

• protons only

• protons and neutrons

• protons, neutrons and electrons

• protons and electrons

Tags

NGSS.MS-PS1-1

How many neutrons are there for an atom with a mass of 20 and 11 protons?

• 9

• 11

• 20

• 31