Atom Structure And Periodic Table

Question 1

What property did Mendeleev use to classify the Periodic Table?

Accepted Answer

He based it on increasing atomic mass

Question 2

Neutrons have ___ charge. Neutrons are found _____________________ of an atom.

Accepted Answer

No, inside the nucleus

Question 3

List 3 properties of non-metals.

Accepted Answer

Often dull and brittle., Poor conductors of heat and electricity., Mostly gases at room temperature.

Question 4

List 3 properties of metals.

Accepted Answer

Most are solids at room temperature., Some are ductile., Most of them are malleable.

Question 5

List 3 properties of halogens.

Accepted Answer

Don't exist as free elements., React with metal to form a salt., Form compounds with metals

Question 6

Define displacement method for finding volume.

Accepted Answer

Volume of water with object - volume of water without object

Question 7

The number of protons is also called the ______________.

Accepted Answer

Atomic Number

Question 8

What are two differences between a group and a period?

Accepted Answer

Group:↑&↓, Period: ⇄ by atomic #/ Groups have same traits

Question 9

The atomic mass is equal to the number of ____________ plus _____________.

Accepted Answer

Protons plus Neutrons

Question 10

What is the group that occupies the center of the periodic table called?

Accepted Answer

Transition Elements

Question 11

What is the formula for density?

Accepted Answer

Mass divided by volume

Question 12

Approximately what percent of elements are metals on the periodic table?

Accepted Answer

75%

Question 13

Which two parts of an atom have the same mass?

Accepted Answer

Protons and Neutrons

Question 14

what is the 18th group called?

Accepted Answer

Noble gases

Question 15

List 1-2 properties of Noble gases.

Accepted Answer

Full outer energy level, 18th group & don't react to make compounds.

Question 16

Why does the nucleus have a positive charge?

Accepted Answer

protons have +chg & neutrons have no chg making it + overall

Question 17

In a neutral atom, the number of protons equals the number of _________.

Accepted Answer

Electrons

Question 18

What does the word Periodic mean?

Accepted Answer

A certain repeating pattern

Question 19

What is the charge of the nucleus?

Accepted Answer

Positive

Questions 19