LESSON
Isotopes Lesson
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17 slides

# Isotopes Lesson

by Andrew Baldwin

# ​Objectives

​Students will be able to explain how the atomic structure of isotopes are similar and different from one another.

Q.

Niels Bohr added _______________ to the model of the atom.

electrons.

a nucleus.

neutrons.

energy levels.

Q.

Which of the following is the best description of J.J. Thomson's model of the atom?

a featureless, indivisible sphere

a sphere of positive material with electrons embedded in it

mostly empty space with electrons randomly orbiting around a positive nucleus

mostly empty space with electrons located in set orbits around a positive nucleus.

Q.

Who proposed the following model for the atom?

"Atoms are solid spheres. Each element is made of a different type of atom."

Bohr

Dalton

Rutherford

Q.

How many protons are in a Chlorine atom? (Mass number = 35)

17

35

35.45

18

Q.

How many neutrons are in a Phosphorus atom? (Mass Number = 31)

15

30.9738

16

31

# ​Reading the Symbol

• ​Note: This is not reflective of the Periodic table Organization.

• ​Mass Number provided at the top and atomic number sometimes at the bottom.

• ​The only change should be the top number.

# ​Anything else?

• ​Sometimes it is given in Hyphen notation.

• ​Element symbol or name hyphen (dash) Mass Number.

Q.

In a correctly written symbol what would be located in the "A" position?

number of neutrons

atomic number

number of electrons

mass number

Q.

What quantities vary between isotopes of an element?

protons, electrons, and atomic mass

protons, electrons, and atomic number

neutrons and electrons

neutrons and atomic mass

Q.

What do these isotopes of carbon all have in common?

neutrons & mass number

atomic number and neutrons

atomic number and electrons

protons, atomic number, and mass number

Q.

How many protons does this isotope of titanium have?

48

22

26

70

Q.

Isotopes are atoms of the same element with different #’s of __________ & therefore different __________.

n0 ;  atomic #’s

p+ ; atomic #’s

e- ; atomic masses

n0 ; atomic masses

Q.

If X is the symbol for an element, which of the following two symbols represent isotopes of the same element?

I and II

III and IV

I and IV

I and III

# ​Time for Practice

​Back to Canvas and Complete Counting Particles Level 2