Catalyst (4 min) What is the name of the isotope below? Why is this atom neutral?

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What is the name of the isotope below? Element – Mass# 4 protons Beryllium Mass# = 4p + 5n = 9 Isotope Name: Beryllium-9

Why is this atom neutral? same # protons and electrons Opposite charges (+/-) The charges cancel out!

NOTE: QUIZ TOMORROW!

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Announcements:

Quiz TOMORROW! Homework due Monday (11/1/10)

What’s on the quiz:

Know the names, charges, masses and locations in the atom of the three subatomic particles

Draw atoms – correct number of protons, neutrons and electrons in the correct places

Be able to determine the number of protons, neutrons and electrons in the atom

Be able to name isotopes

Atomic Structure and Isotopes Review

10-28-10

How the Game Works… Question on the screen Work with your groups To get the point

Board in the air on time Correct answer

Team with the most points WINS (HW Pass) Points off:

Cheating Lack of participation Whining/ Arguing Disrespectful language/behavior

Question #1

What is the smallest unit of an element that retains the identity of the element?

The ATOM!

Question #2 What subatomic particle has no charge

and where is it located?

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-Neutron

In the nucleus

Question #3

An element has 9 protons, 10 neutrons and 9 electrons. What element is the atom?

9 protons

FLUORINE!

Question #4

If an atom has 11 protons, how many electrons does it have?

11

# protons = # electrons

Question #5

Why do atoms have a neutral charge overall even though they are made of charged particles?

#protons = # electrons

Protons (+) and electrons (-) have opposite charges

The charges cancel out!

Question #6

If an atom has 5 protons, 5 electrons and 7 neutrons, what is the atomic mass of the atom?

Mass = #p + #nMass = 5 + 7Mass = 12

Question #7

What is the name of the isotope with 6 protons, 7 neutrons, and 6 electrons?

Element name? Carbon

Mass number? 6 + 7 = 13

Carbon-13

Question #8

What are two reasons why scientists use symbols to represent the different elements?

Easier to write

All scientists use the same symbols

Question #9

How many charged particles are in one sodium (Na) atom? (Hint: which particles are charged?)

Protons and electrons have charges

11 protons + 11 electrons

22 charged particles!

Question #10

What is the element symbol of an atom with 19 protons and 17 neutrons?

Atomic # = 19

Potassium

K

Question #11

What is the name of an isotope with 19 protons and 17 neutrons?

Element? Potassium

Potassium-36

Mass Number? 19 + 17 = 36

Question #12

An atom has a mass number of 15 and 9 protons. How many neutrons does the atom have?

Mass number = #p + # n

15 = 9 + # n

6 = # n

Question #13The atomic number of an atom is 8 and the

atomic mass is 14. How many protons, electrons and neutrons are in the atom?

Atomic # = # protons8 protons!

# protons = # electrons8 electrons!

Mass number = #p + #n14 = 8 + #n6 neutrons!

Question #14

What is the element symbol of an atom with a mass number of 27 and 11 neutrons?

Mass number = #p + #n27 = #p + 11#p = 27 -11

#p = atomic # = 116Sulfur

S

Question #15

What is the name of the isotope below?

10 protons

5 neutrons

Neon-15

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Question #16 What is the atomic number of the atom

below?

Atomic # = 10 What is the mass number of the atom below?

mass number = 15

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