🩷Unit 2: Basic Atomic Structure

Question 1

Atoms

Answer 1

smallest stable unit of matter

Question 2

What makes up an atom?

Answer 2

protons (+) in nucleus
neutrons (0) in nucleus
electrons (-) orbits nucleus

Question 3

How many electrons are in the 1st energy level?

Answer 3

2 electrons

Question 4

How many electrons are in the 2nd energy level?

Answer 4

8 electrons

Question 5

How many electrons are in the 3rd energy level?

Answer 5

18 electrons

Question 6

Filled Electron Shell

Answer 6

not reactive, stable atom

Question 7

Incomplete Electron Shell

Answer 7

needs electrons, active

Question 8

Atomic Number

Answer 8

number of protons in an atom

Question 9

Mass Number

Answer 9

number of protons + neutrons

Question 10

Element

Answer 10

can’t be divided into different substances, composed of only one type of atom

Question 11

What elements make up the body?

Answer 11

Carbon (C)
Oxygen (O)
Hydrogen (H)
Nitrogen (N)

Question 12

What are the major minerals in the body?

Answer 12

Sodium(Na)
Calcium(Ca)
Potassium(K)
Chlorine(Cl)
Magnesium(Mg)
Phosphorus(P)

Question 13

What are the trace elements?

Answer 13

Iron (Fe)
Iodine (I)
Zinc (Zn)

Question 14

Molecule

Answer 14

combination of 2 or more atoms
(ex: O2, H2O)

Question 15

Compound

Answer 15

combination of 2 or more different atoms (ex: NaCl)

Question 16

Isotopes

Answer 16

atoms with the same number of protons, but different mass numbers
(ex: 12C = 6p,6e,6n 13C = 6p,6e,7n)

Question 17

Radioisotopes

Answer 17

subatomic particles emitted by isotopes