Unit 4 Review: Molecules and the Periodic Table

Question 1

Mendeleev created the first periodic table by arranging the elements in order of _____.

Accepted Answer

increasing atomic mass

Question 2

Which of the following statements about transition metals is true?

Accepted Answer

They include metals such as gold, silver and copper

Question 3

Sodium has 11 protons, 12 neutrons and 11 electrons. What is it's mass number?

Accepted Answer

23

Question 4

The chemical equation shown represents photosynthesis. Which substance presented is an element?

Accepted Answer

O2

Question 5

As you go down the Group/Family, metals will

Accepted Answer

Increase in Reactivity

Question 6

If an atom has 15 electrons, how many protons will it have?

Accepted Answer

15

Question 7

The elements that do not ordinarily react or form compounds are ______.

Accepted Answer

noble gases

Question 8

What are non-metals used for?

Accepted Answer

Insulators

Question 9

What is unique about noble gases?

Accepted Answer

Are non-reactive, Don't form compounds

Question 10

The elements in a column of the periodic table ____.

Accepted Answer

have similar properties

Question 11

How does the atomic mass of the elements change as you move from top to bottom on the table?

Accepted Answer

Mass increases

Question 12

A molecule ...

Accepted Answer

is made of any two atoms bonded together

Question 13

Which group of elements share characteristics with both metals and non-metals?

Accepted Answer

metalloids

Question 14

Fluorine, chlorine, bromine and iodine are part of a family called _____.

Accepted Answer

halogens

Question 15

Which of the following statements about metals is true?

Accepted Answer

Metals show a wide range of chemical properties

Question 16

Sodium has 11 protons, 12 neutrons and 11 electrons. What is it's atomic number?

Accepted Answer

11

Question 17

A medicine contains lactose, C12H22O11. Based on the lactose formula, what can you conclude?

Accepted Answer

A lactose molecule contains 12 atoms of carbon

Question 18

Which of the following is a molecule?

Accepted Answer

CO

Question 19

How does the reactivity of elements change as you move from left to right on the table?

Accepted Answer

Decreases reactivity

Question 20

Which group contains the most elements?

Accepted Answer

metals

Question 21

The smallest part of an element that still maintains the properties of that element is:

Accepted Answer

An atom

Question 22

A material is ductile if it _____.

Accepted Answer

can be pulled or drawn into a long wire

Question 23

How did chemists change Mendeleev's periodic table?

Accepted Answer

They added previously unknown elements

Question 24

Which of the following is NOT a property common to non-metals?

Accepted Answer

conduct electricity easily

Question 25

A compound ...

Accepted Answer

Must be made of at least two different elements, Is always a molecule

Question 26

In an atom, the number of protons equals the number of ____.

Accepted Answer

electrons

Question 27

In the periodic table, the most reactive elements are found in _____.

Accepted Answer

Group 1, the first column on left

Question 28

What information in the periodic table indicates the number of protons in an atom?

Accepted Answer

the element's atomic number

Unit 4 Review: Molecules and the Periodic Table

Questions 28

Unit 4 Review: Molecules and the Periodic Table

Questions 28