Chapter 2 Elements, Chemical Bonds, Water

Question 0

Element

Answer 0

Substance that cannot be broken down to other substances by chemical reactions

Question 1

Matter

Answer 1

Anything that takes up space and has mass, made up of elements

Question 2

Compound

Answer 2

Substance consisting of two or more elements in a fixed ratio and composed of two different elements

Question 3

Atoms

Answer 3

Smallest unit of matter that still retains properties of an element; composed of subatomic particles

Question 4

Neutrons

Answer 4

No electrical charge

Question 5

Protons

Answer 5

Positive charge

Question 6

Electrons

Answer 6

Negative charge

Question 7

Atomic number

Answer 7

Number of protons in nucleus

Question 8

Isotopes

Answer 8

Two atoms of an element that differ in number of neutrons

Question 9

Radioactive isotopes

Answer 9

Decay spontaneously giving off particles and energy.
Applications:
Dating fossils, tracing atoms through metabolic processes, diagnosing medical disorders

Question 10

Electron shell

Answer 10

Electron’s state of potential energy, energy level

Question 11

Valence shell

Answer 11

Electrons in outermost shell