LESSON

Isotopes Lesson

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10th - 12th grade

Chemistry, Science

a day ago by

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.

answer choices

electrons.

a nucleus.

neutrons.

energy levels.

Q.

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

answer choices

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."

answer choices

Bohr

Chadwick

Dalton

Rutherford

Q.

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

answer choices

17

35

35.45

18

Q.

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

answer choices

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?

answer choices

number of neutrons

atomic number

number of electrons

mass number

Q.

What quantities vary between isotopes of an element?

answer choices

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?

answer choices

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?

answer choices

48

22

26

70

Q.

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

answer choices

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?

answer choices

I and II

III and IV

I and IV

I and III

Time for Practice

Back to Canvas and Complete Counting Particles Level 2

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