Biology 6.1

Question 1

Atoms

Answer 1

The building blocks of matter

Question 2

Nucleus

Answer 2

The center of the atom

Question 3

Proton

Answer 3

• Positively charged particles (p subscript +)
• Located: INSIDE the nucleus

Question 4

Neutron

Answer 4

• Particles that have no charge (n subscript 0)
• Located: INSIDE the nucleus

Question 5

Electron

Answer 5

• Negatively charged particles (e subscript -)
• Located: OUTSIDE the nucleus

Question 6

Element

Answer 6

A pure substance that can’t be broken down into other substances by physical or chemical means

Question 7

Isotope (Elem and N)

Answer 7

Atoms of the same element that have different #s of neutrons

Question 8

Compound (Elem)

Answer 8

A pure substance formed when 2 or different elements combine

Question 9

Radioactive isotopes

Answer 9

When isotope is radioactive, the nucleus starts to decay/break apart

Question 10

Chemical bonds

Answer 10

The force that holds substances together

Question 11

Ionic bonds

Answer 11

An electrical attraction between two oppositely charged atoms/groups of atoms (called ions)

Question 12

Covalent bonds (E)

Answer 12

The bond that forms when electrons are shared

Question 13

Molecule(Co)

Answer 13

A compound in which the atoms are held together by covalent bonds

Question 14

Ions (2)

Answer 14

An atom that: (2)
1. has lost or gained 1+ electrons
2. carries an electric charge

Question 15

Atomic number

Answer 15

number of protons

Question 16

Atomic mass/number

Answer 16

number of protons + number of neutrons