Atoms,Bonding and Periodic Table ch.2

Question 1

valence electrons

Answer 1

are those electrons that have the highest energy level and are held loosly.

Question 2

electron dot diagram

Answer 2

it includes the symbol for the element surrounded by dots.

Question 3

chemical bond

Answer 3

is the force of Attraction that holds two atoms together as a result of rearrangement of elements between them.

Question 4

symbol

Answer 4

usually consisting of one or two elements. It shows what the element is on the periodic table.

Question 5

atomic number

Answer 5

It is the number of protons in the nucleus of an atom.

Question 6

period

Answer 6

a row of elements across the periodic table.

Question 7

group

Answer 7

elements in the same column.

Question 8

family

Answer 8

groups of elements like metals, non metals, noble gases, halogens etc.

Question 9

noble gas

Answer 9

group 18 elements are known as noble gases. They have a full outer shell of 8 elements and so they are happy.

Question 10

halogen

Answer 10

they are the elements in group 17 and because they only need 1 more element to be happy they are very reactive and connect with many elements ex. metals.

Question 11

alkali metal

Answer 11

they are the elements in group 1 and they are very reactive (except for Hydrogen,it is not an alkali metal but still is in group 1)

Question 12

______________________are those electrons that are held most loosely in an atom.

Answer 12

valence electrons

Question 13

The number of valence electrons in an atom of an element determines the ways in which the atom can bond. TRUE or FALSE

Answer 13

True

Question 14

Identify each element and number of valence electrons.

H* C** 0**

Answer 14

hydrogen,1
Carbon,4
Oxygen,6

Question 15

Atoms with 8 valence electrons are less likely to form chemical bonds than atoms with fewer valence electrons. TRUE or FALSE

Answer 15

True

Question 16

How are elements represented in the periodic table?

Answer 16

By groups and their Atomic Numbers and symbols

Question 17

The __________________ of an element is the number of protons in the nucleus of an atom.

Answer 17

Atomic number

Question 18

What is a row of elements across the periodic table called?

Answer 18

Period

Question 19

Describe how atomic number changes across a period of elements.

Answer 19

they increase by 1 like, 19, 20 21, until it ends.

Question 20

What are elements in the same column of the periodic table called?

Answer 20

group

Question 21

Elements within a group always have the same number of __________________________.

Answer 21

valence electrons

Question 22

How many valence electrons can atoms of nonmetals have?

Answer 22

always more than 4.

Question 23

Describe two ways the nonmetals can combine with other elements.

Answer 23

share electrons or

give electrons

Question 24

Compared to metals and nonmetals how do atoms of metalloids behave when combining with atoms of other elements?

Answer 24

Depending on the conditions they can be metals of nonmetals because they have 3-6 valence electrons. So when they combine they can loose or share valence electrons.

Question 25

Hydrogen is considered to be a metal. TRUE or FALSE

Answer 25

false