Science-Chp.4;Introduction to Atoms

Question 1

Atom

Answer 1

the smallest particle into which an element can be divided and still be the same substance

Question 2

Electrons

Answer 2

a subatomic particle that has a negative charge

Question 3

Nucleus

Answer 3

an atoms central region, which is made up of protons and neutrons

Question 4

Electron clouds

Answer 4

regions inside the atom where electrons are likely to be found

Question 5

Protons

Answer 5

a positively charged particle in the nucleus

Question 6

Atomic Mass Unit

Answer 6

the SI unit used to express the masses of particles in atoms

Question 7

Neutrons

Answer 7

the particles of the nucleus that have no electrical charge

Question 8

Atomic Number

Answer 8

The number of protons in the nucleus of an atom

Question 9

Isotope

Answer 9

Atoms that have the same number of protons but have different numbers of neutrons

Question 10

Mass number

Answer 10

the sum of the protons and neutrons in an atom

Question 11

Atomic mass

Answer 11

the mass of an atom expresses in atomic mass units