Question 1

Which symbol represents an atom with 9 protons and 10 electrons?

Accepted Answer

A)   Ne-
B)   Na+
C)   Ne+
D)   F-

Question 2

_____ allows scientists to construct images showing how atoms combine to form molecules.

Accepted Answer

A)   X-ray crystallography
B)   Scanning tunneling microscopy
C)   Cathode ray tubes
D)   Atomic theory A

Question 3

Which element is NOT a metal?

Accepted Answer

A)   Li
B)   N
C)   Sn
D)   Co

Question 4

Which symbol represents an atom with 8 protons and 10 electrons?

Accepted Answer

A)   Ne-
B)   O2-
C)   Na+
D)   Na-

Question 5

An atom that loses an electron is:

Accepted Answer

A)   known as a cation.
B)   known as an anion.
C)   still called an atom.
D)   known as an isotope.

Question 6

Which pair of atoms has similar chemical properties?

Accepted Answer

A)   Li and Be
B)   Li and Na
C)   O and F
D)   F and He

Question 7

An atom that gains an electron is:

Accepted Answer

A)   known as a cation.
B)   known as an anion.
C)   still called an atom.
D)   known as an isotope.

Question 8

Rutherford's gold foil experiment showed that:

Accepted Answer

A)   atoms are neither created nor destroyed.
B)   atoms are mostly empty space with a very dense nucleus.
C)   atoms contain electrons.
D)   atoms can combine to form compounds.

Question 9

The symbol for iron,as shown on the periodic table,is given here.What is the atomic number of iron?

Accepted Answer

A)   Fe
B)   26
C)   55.845
D)   19.9845

Question 10

A certain element is composed of two isotopes,having the mass and abundance shown in the table.What is the average atomic mass for this element? Mass
Abundance
Isotope 1
6.0 u
7.59%
Isotope 2
7.0 u
92.41%

Accepted Answer

A)   6.0 u
B)   6.1 u
C)   7.0 u
D)   6.9 u

Question 11

Which scientist proposed that electrons orbit the nucleus like planets orbit the Sun?

Accepted Answer

A)   Dalton
B)   Rutherford
C)   Bohr
D)   Thomson

Question 12

Which element is NOT a metal?

Accepted Answer

A)   Mg
B)   S
C)   Sn
D)   Ti

Question 13

Which subatomic particle will be attracted to a negatively charged metal plate?

Accepted Answer

A)   a proton
B)   a neutron
C)   an electron
D)   All of these particles will be attracted to the metal plate. A

Question 14

What two particles reside in the nucleus?

Accepted Answer

A)   protons and electrons
B)   electrons and neutrons
C)   protons and neutrons
D)   futons and protons C

Question 15

Which symbol BEST represents a lithium cation?

Accepted Answer

A)   Li(cat) 
B)   Li+
C)   Li-
D)   Li

Question 16

Which subatomic particle will be attracted to a positively charged metal plate?

Accepted Answer

A)   a proton
B)   a neutron
C)   an electron
D)   All of these particles will be attracted to the metal plate.

Question 17

The law of conservation of _____ tells us that matter is not created or destroyed in a chemical reaction.

Accepted Answer

A)   energy
B)   mass
C)   atoms
D)   compounds

Question 18

Which scientist developed the periodic table?

Accepted Answer

A)   Democritus
B)   Dalton
C)   Thomson
D)   Mendeleev

Question 19

Rust has the formula Fe2O3,and it's made from iron metal reacting with oxygen over time.Assume that you had a 2.0-g block of pure iron metal that fully oxidized to rust and the mass of that product was 6.5 g.What must have been the mass of oxygen that initially reacted with pure iron?

Accepted Answer

A)   2.0 g
B)   6.5 g
C)   4.5 g
D)   4.0 g

Question 20

The atomic number tells us:

Accepted Answer

A)   the sum of all the particles in the nucleus.
B)   the number of electrons in a neutral atom.
C)   the number of protons in a nucleus.
D)   both the number of electrons in a neutral atom and the number of protons in a nucleus .

Exam 3: Atoms

Which symbol represents an atom with 9 protons and 10 electrons?

Correct AnswerverifiedShow Answer

_____ allows scientists to construct images showing how atoms combine to form molecules.

Correct AnswerverifiedA

Which element is NOT a metal?

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Which symbol represents an atom with 8 protons and 10 electrons?

Correct AnswerverifiedShow Answer

An atom that loses an electron is:

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Which pair of atoms has similar chemical properties?

Correct AnswerverifiedShow Answer

An atom that gains an electron is:

Correct AnswerverifiedShow Answer

Rutherford's gold foil experiment showed that:

Correct AnswerverifiedShow Answer

The symbol for iron,as shown on the periodic table,is given here.What is the atomic number of iron?

Correct AnswerverifiedShow Answer

A certain element is composed of two isotopes,having the mass and abundance shown in the table.What is the average atomic mass for this element? Mass Abundance Isotope 1 6.0 u 7.59% Isotope 2 7.0 u 92.41%

Correct AnswerverifiedShow Answer

Which scientist proposed that electrons orbit the nucleus like planets orbit the Sun?

Correct AnswerverifiedShow Answer

Which element is NOT a metal?

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Which subatomic particle will be attracted to a negatively charged metal plate?

Correct AnswerverifiedA

What two particles reside in the nucleus?

Correct AnswerverifiedC

Which symbol BEST represents a lithium cation?

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Which subatomic particle will be attracted to a positively charged metal plate?

Correct AnswerverifiedShow Answer

The law of conservation of _____ tells us that matter is not created or destroyed in a chemical reaction.

Correct AnswerverifiedShow Answer

Which scientist developed the periodic table?

Correct AnswerverifiedShow Answer

Rust has the formula Fe2O3,and it's made from iron metal reacting with oxygen over time.Assume that you had a 2.0-g block of pure iron metal that fully oxidized to rust and the mass of that product was 6.5 g.What must have been the mass of oxygen that initially reacted with pure iron?

Correct AnswerverifiedShow Answer

The atomic number tells us:

Correct AnswerverifiedShow Answer

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C

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Rust has the formula Fe₂O₃,and it's made from iron metal reacting with oxygen over time.Assume that you had a 2.0-g block of pure iron metal that fully oxidized to rust and the mass of that product was 6.5 g.What must have been the mass of oxygen that initially reacted with pure iron?

Correct Answer
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