Basic Chemistry

What is the ratio of hydrogen to oxygen in H2O

• 1:2

• 2:1

• 1:1

• 1:3

Tags

NGSS.MS-PS1-1

The atomic number of an element is

• The number of neutrons in the nucleus

• The number of electrons in an ion of that element

• the number of protons in the nucleus

• The number of protons and neutrons in the nucleus

What is an ion?

• It is formed when an atom donates a proton

• It is formed when a nucleus donates a neutron

• It is formed when an atom donates or accepts an electron

• It is formed when an atom shares electrons

Tags

NGSS.MS-PS1-5

What is the valence number of the Halogens

• 6

• -1

• +1

• 5

Ionic bonds are formed

• When non-metals react together to form solids

• When 2 metals react together to achieve the octet rule

• When metals react with non-metals and ions are formed

• When transition metals react together

Tags

NGSS.MS-PS1-5

The elements in Group 8 are called

• alkali metals

• noble gases

• halogens

• alkaline earth metals

Are Noble gases very reactive

• sometimes

• No

• Very reactive

• yes

In this compound, what is the ratio of atoms HCl

• 1:2

• 2:1

• 3:1

• 1:1

Tags

NGSS.MS-PS1-1

What is the charge on an electron

• Positive

• Negative

• Neutral

• Non of these

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

The Group number of an element tells us

• The number of electrons on the outer most energy shell of the atom

• The number of energy shells of electrons in an atom

• The charge on the element

• The mass of the element