Atomic Structure

ATOMS

…

ATOMS

Prayer ▷ Play

+ My List

We praise you Lord and we thank you for the opportunity to study and prepare for a good life in the future. Bless our teachers who inspire and guide us. Bless our parents who work hard to support us. Bless our classmates and all the people who care for us.Bless us, help us to be more attentive, patient and diligent to understand the lessons that our teachers teach us. This we pray in the name of Jesus Christ our Lord. Amen.

…

ATOMS

Guess My Mass ▷ Play

+ My List

Ne

Directions: Bring out your periodic table, identify each element and give their respective atomic mass.

Ag Mg

B Fe

What are the objectives?

Differentiate atomic number, mass number, and isotopes, and which of these distinguishes one element from another

Write isotopic symbols

Recognize common isotopes and their uses

…

ATOMS

Atoms ▷ Play

+ My List

• The word “atom” comes from the ancient Greek word meaning ”undivided.” • They thought that an atom couldn’t be cut into anything smaller, which we now know is not exactly right.

…

ATOMS

Atomic Structure ▷ Play

+ My List

• an atom has a central positively charged nucleus consisting of protons and neutrons surrounded by a number of electrons • the number of electrons is equal to the number of protons • the whole structure is electrically neutral

……

ATOMS

Atomic Structure ▷ Play

+ My List

Proton

Neutron

Electron

Location

Nucleus

Nucleus

Outside Nucleus

Charge

+1

0

-1

Relative mass

1

1

0.0006

…

ATOMS

Atomic Number ▷ Play

+ My List

• the number of protons in the nucleus of an atom of a given element.

79

Au Gold 196.96657

…

ATOMS

Atomic Mass ▷ Play

+ My List

• the mass of an atom of a chemical element expressed in atomic mass units 47

Ag Silver 107.8682

…

ATOMS

FTBU ▷ Play

+ My List

Atomic number

No. of protons

No. of electrons

Mass number

No. of protons

No. of neutrons

No. of neutron

Mass number

Atomic number

Formula to be used to get the following: • atomic number, • mass number and • no. of neutron

…

ATOMS

Examples ▷ Play

+ My List

Element

Symbol

Atomic #

Mass #

# of p+

# of n

# of e-

Magnesium

Mg

12

24

12

12

12

Neon

Ne

10

20

10

10

10

Boron

B

5

11

5

6

5

…

ATOMS

Activity ▷ Play

+ My List

Element

Symbol

Atomic #

Mass #

# of p+

# of n

# of e-

Helium

He

2

4

2

2

2

Zinc

Zn

30

65

30

35

30

Aluminum

Al

13

27

13

14

13

Sodium

Na

11

23

11

12

11

Calcium

Ca

20

40

20

20

20

Silver

Ag

47

108

47

61

47

Krypton

Kr

36

84

36

48

36

…

ATOMS

Isotopes ▷ Play

+ My List

• The term "isotope" was introduced by the British chemist Frederick Soddy in 1913, as recommended by Margaret Todd. The word means "having the same place" from the Greek words isos "equal" (iso-) + topos "place." Isotopes occupy the same place on the periodic table even though the isotopes of an element have different atomic weights.

…

ATOMS

Isotopes ▷ Play

+ My List

• Are atom of an element having the same atomic number but different mass number. • The atoms of isotopes of an element differ in the number of neutrons.

…

ATOMS

Isotopes ▷ Play

+ My List

Atomic Atomic mass mass

Relative Relative abundance abundance

Nature Radioactive Radioactive or or nonnonradioactive radioactive

Name Name

Symbol Symbol

Atomic Atomic number number

Protium or Protium or Hydrogen Hydrogen

or H

1 1

1 1

99.99% 99.99%

Non-radioactive Non-radioactive

Deuterium Deuterium

or D

1 1

2 2

0.015% 0.015%

Non-radioactive Non-radioactive

Tritium Tritium

or T

1 1

3 3

10-18% 10-18%

Radioactive Radioactive

…

ATOMS

Homework ▷ Play

+ My List

Review all our previous topics: • • • •

Introduction of Chemistry Matter and its Properties Measurements Atoms  Dalton’s atomic theory  Atomic Structure

…

ATOMS

▷ Play

+ My List

ATOMS

References https://www.dictionary.com/browse/atomic-structure#:~:text=for%20atomic%20st ructure-,atomic%20structure,entity%20is%20thus%20electrically%20neutral https://languages.oup.com/google-dictionary-en/ https://www.icegif.com/wp-content/uploads/mercury-icegif-1.gif https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcSr88R4-ZRussdp8AFHyN yvLeEJ1rIiHfL1WQ&usqp=CAU

…