Atoms And Periodic Table

Question 1

Pure substance made of only one type of atom

Answer 1

Element

Question 2

Way to represent an element

Answer 2

Symbol

Question 3

Positively charged particles in the nucleus

Answer 3

Proton

Question 4

Neutral particles in the nucleus

Answer 4

Neutron

Question 5

Negatively charged particles that orbit around the nucleus

Answer 5

Electron

Question 6

Center of an atom;made of protons and neutrons

Answer 6

Nucleus

Question 7

Usually solid at room temperature
Usually has luster
Good conductors of energy

Answer 7

Metals

Question 8

Most are gases
If solids they are brittle
Poor conductors of heat and electricity
Usually lustrous

Answer 8

Nonmetals

Question 9

The stair step line
Can be found as solids, liquids, or gases
Properties of metals and nonmetals

Answer 9

Metalloids

Question 10

Atomic mass unit used to measure mass of atomic particles

Answer 10

AMU

Question 11

The smallest piece of matter that still retains properties of the elements

Answer 11

Atom

Question 12

The number of protons

Answer 12

Atomic number

Question 13

The sum of protons and neutrons in atom

Answer 13

Mass number

Question 14

Smaller particles that make up protons and electrons

Answer 14

Quarks

Question 15

Late 1800s
Russian chemist
Organized periodic table by mass number

Answer 15

Mendeleev

Question 16

1913
English scientist
Arranged periodic table by atomic number

Answer 16

Moseley

Question 17

Atoms of the same element with a different number of neutrons

Answer 17

Isotope

Question 18

Vertical columns
18 of them
Similar properties

Answer 18

Group

Question 19

Horizontal
Energy levels

Answer 19

Period