H.Chem- 70% Summative- Unit 3: Atomic Structure

Refer to image 1 to complete the missing items in image 2

protons = red, neutrons= white, electrons= blue

a

b

c

He

0

Be

4

Li

2

2-

2+

1

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NGSS.HS-PS1-2

What does the number 91 represent in the name zirconium-91?

• the atomic number

• the number of protons

• the mass number

• the sum of protons and electrons

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CHECK BOX ALL THE CORRECT ANSWERS for the statement "An atom of NEON has an atomic number of 10 and a mass number of 20."

• 12 electrons

• 10 protons

• There are 10 particles (electrons) OUTSIDE of the nucleus in orbits

• There are 20 subatomic particles (protons and neutrons) inside the nucleus

• There are 10 particles (neutrons) OUTSIDE of the nucleus in orbits

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An atom has an atomic number of 32 and a mass number of 73. How many protons, neutrons, and electrons does this atom contain?

• 32 protons, 73 neutrons, 32 electrons

• 73 protons, 73 neutrons, 41 electrons

• 32 protons, 41 neutrons, 32 electrons

• 41 protons, 32 neutrons, 41 electrons

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Carbon-12 and carbon-14 are ​ (a)   so they have the same ​ (b)   but different ​ (c)  

• isotopes
• atoms
• ions
• mass numbers
• atomic numbers
• electrons

An atom that has 15 protons and 16 neutrons is an isotope of what element? (spelling counts)

Which of the following statements best defines an ion?

• An atom or group of atoms that shares electrons equally with another atom.

• An atom or molecule that has gained or lost one or more electrons.

• A neutral atom that contains the same number of protons and electrons.

• A neutral atom that contains the same number of protons and neutrons.

Convert 14.0 g of PbSO₄ into_____________ formula units

(SHOW ALL WORK ON THE 1/2 SHEET)

• 2.78 x 10²² formula units PbSO₄

• 3.30 x 10²² formula units PbSO₄

• 1.20 x 10²⁴ formula units PbSO₄

• 5.05 x 10²¹ formula units PbSO₄

The following diagram shows which model of the atom?

• Dalton's Model
• The Plum Pudding Model
• Bohr's Model
• Schrodinger's Model

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What scientist is best known for his "Plum Pudding" model of the atom?

• J.J. Thomson
• Ernest Rutherford
• John Dalton
• Democritus