16.2 - Masses of Atoms(25Pts.)

The element hydrogen has three naturally occurring isotopes.

Which of the following describes the relationship of these isotopes?

Isotopes have (a)   mass numbers, but (b)   number of protons.

• different

• the same

Answer explanation

The isotopes of hydrogen have different mass numbers but the same number of protons, making the correct answers 'different' and 'the same'.

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HS-PS1-1

The atomic number of yttrium is 39. The atomic mass of one of its isotopes is 89.

How many neutrons are in an atom of this isotope of yttrium?

Mathematical Equivalence

ON

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HS-PS1-1

Organize these options into the right isotopes

Groups:

(a) Carbon - 12

,

(b) Carbon - 14

• 
• 

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HS-PS1-1

Organize these options into the right isotopes

Groups:

(a) Oxygen - 16

,

(b) Oxygen - 17

,

(c) Oxygen - 18

• 
• 
• 

Tags

HS-PS1-1

Organize these options into the right isotopes

Groups:

(a) Hydrogen - 1

,

(b) Hydrogen - 2

,

(c) Hydrogen - 3

• 
• 
• 

Tags

HS-PS1-1

Use your understanding of Atomic Mass to complete the Table.

e

f

g

h

6

9

1

24

12

5

63

8

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Atoms consist of negatively charged (a)   that orbit the (b)   . The nucleus consists of positively charged (c)   and neutral (d)   . Protons and neutrons are each made from three (e)   .

• electrons

• nucleus

• protons

• neutrons

• quarks

Answer explanation

Atoms consist of negatively charged electrons that orbit the nucleus. The nucleus consists of positively charged protons and neutral neutrons. Protons and neutrons are each made from three quarks.

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HS-PS1-1

Match the following letters with their correct representation in atomic structure.

• Letter representing the nucleus

• D

• Letter representing a neutron

• C

• Letter representing a proton

• A

• Letter representing an electron

• B

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What does the atomic number of an element represent?

• The number of protons in the nucleus

• The number of neutrons in the nucleus

• The total number of protons and neutrons in the nucleus

• The total number of protons and electrons in an atom

Answer explanation

The atomic number of an element represents the number of protons in the nucleus.

Tags

HS-PS1-1

What is the ATOMIC MASS of this Atom?

Mathematical Equivalence

ON

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HS-PS1-1