How many particles does an atom with an atomic number 50 and a mass number 120 contain?

50 protons, 50 electrons, and 70 neutrons

The nucleus of an atom is _____.

positively charged and has a high density

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College Prep Chemistry Semester 1 Final Review1

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Atomic Theory/Structure, Periodic Trends, Chemical Bonding, Thermochemistry

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Questions 15

Answers

1
Isotopes of the same element have different _____.
numbers of electrons
numbers of protons
numbers of neutrons
atomic numbers
2
How many particles does an atom with an atomic number 50 and a mass number 120 contain?
120 neutrons, 50 protons, and 70 electrons
50 protons, 50 electrons, and 70 neutrons
70 neutrons, 70 protons, and 50 electrons
70 electrons, 50 protons, and 50 neutrons
3
Which of the following elements has the greatest atomic radius?
Cl
Ca
Ne
Na
4
Which of the following elements is a Noble Gas?
Ca
Ne
Cl
Na
5
What particles form the nucleus of an atom?
neutrons and electrons
protons and electrons
protons and neutrons
electrons only
6
Which of the following elements is a metalloid?
Si
Hg
W
Fe
7
The nucleus of an atom is _____.
positively charged and has a high density
negatively charged and has a high density
positively charged and has a low density
negatively charged and has a low density
8
Which of the following elements is a nonmetal?
Pt
Kr
Sc
V
9
The atomic number of an element is the total number of which particles in the nucleus?
protons
protons and electrons
protons and electrons and neutrons
neutrons
10
Which of the following elements is in the same period as phosphorus?
nitrogen
magnesium
oxygen
carbon
11
What does the number 84 in the name krypton-84 represent?
the mass number
the atomic mass
the atomic number
the sum of the protons and electrons
12
Which of the following elements has the highest electronegativity?
Ca
Ne
Cl
Na
13
Which of the following elements is an Alkali metal?
Ne
Ca
Na
Cl
14
Neutral atoms of the same element all have the same number of
protons and alpha particles
protons and electrons
neutrons and protons
protons and neutrons
15
What is each vertical column of elements in the periodic table called?
list
group
period
row

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