Which of the following statements is true?

Protons are positively charged and have a mass of 1 amu.

Which discovery did J. J. Thomson make that improved upon Dalton's atomic theory?

Atoms contain tiny, negatively charged electrons.

The nucleus of an atom is

the central core and is composed of protons and neutrons.

neutral, with the number of protons equaling to electrons

Which of the following is true about subatomic particles?

The mass of a neutron nearly equals the mass of a proton.

How do the isotopes hydrogen-1 and hydrogen-2 differ?

Hydrogen-2 has one neutron; hydrogen-1 has none.

Which of the following equals one atomic mass unit?

one-twelfth the mass of one carbon-12 atom

The atomic mass of an element depends upon the

mass and relative abundance of each isotope of that element.

What is the relative mass of an electron?

1/1840 the mass of a hydrogen atom (or a proton)

Which of the following was originally a part of Dalton's atomic theory, but had to be changed

Atoms are tiny indivisible particles.

Which model of the atom is thought to be true?

Electrons occupy almost all the volume of the atom

How is the number of neutrons in the nucleus of an atom calculated?

Subtract the number of protons from the mass number.

Which of the following is correct concerning subatomic particles?

The neutron was discovered by Chadwick in 1932.

an atom with atomic number 50 and mass number 125 contains

50 protons, 50 electrons, 75 neutrons

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Answers

1
Which of the following statements is true?
Protons are positively charged and have a mass of 1 amu.
Electrons are negatively charged and have a mass of 1 amu.
Neutrons are negatively charged and have a mass of 1 amu.
The nucleus is negatively charged
2
Atoms are
there is one atom in a penny for every person on Earth
very large
indivisible
very small
3
Which discovery did J. J. Thomson make that improved upon Dalton's atomic theory?
Atoms contain a tiny, positively charged nucleus.
Atoms are always in motion.
Atoms that combine do so in simple whole-number ratios.
Atoms contain tiny, negatively charged electrons.
4
What is the charge of a neutron? Pick the best answer!!!
Neutral
Positive
Negative
Positive 1
5
The nucleus of an atom is
negatively charged and has a high density.
positively charged and always has more protons than neutrons
negatively charged and has a low density.
the central core and is composed of protons and neutrons.
6
The atomic number of an element is the total number of which particles in the nucleus?
protons and electrons
protons
electrons
neutrons
7
All atoms are
neutral, with the number of protons equaling to electrons
+ charged, with the # of protons exceeding electrons
neutral, with the number of protons = electrons = neutrons
neg charged, with the # of electrons exceeding protons
8
Which of the following is true about subatomic particles?
Electrons are negatively charged and are the heaviest
Protons are positively charged and the lightest
The mass of a neutron nearly equals the mass of a proton.
Neutrons have no charge and are the lightest
9
How do the isotopes hydrogen-1 and hydrogen-2 differ?
Hydrogen-2 has two protons; hydrogen-1 has one.
Hydrogen-2 has one more electron than hydrogen-1.
Hydrogen-2 has one proton; hydrogen-1 has none.
Hydrogen-2 has one neutron; hydrogen-1 has none.
10
Which of the following equals one atomic mass unit?
the mass of one electron
one-twelfth the mass of one carbon-12 atom
the mass of one carbon-12 atom
the mass of one helium-4 atom
11
What do we now know about Dalton's Atomic Thoery?
atoms are divisible.
All of Dalton's hypotheses were correct.
Atoms must all have the same mass.
atoms of an element can have different numbers of protons.
12
The atomic mass of an element depends upon the
relative abundance of protons in that element.
mass of each isotope of that element.
mass of each electron in that element.
mass and relative abundance of each isotope of that element.
13
What is the relative mass of an electron?
1/1840 the mass of a hydrogen atom (or a proton)
1/1840 the mass of a C-12 atom
1/1840 the mass of a neutron + proton
1/1840 the mass of an alpha particle
14
Which of the following was originally a part of Dalton's atomic theory, but had to be changed
The atoms of any one element are different other elements
Compounds are made by combining atoms.
Atoms can combine with one another in whole number ratios.
Atoms are tiny indivisible particles.
15
Isotopes of the same element have different
atomic numbers.
numbers of protons.
numbers of neutrons.
numbers of electrons.
16
What does the number 84 in the name krypton-84 represent?
the atomic number
twice the number of protons
the mass number
the sum of the protons and electrons
17
Who lived from 460 B.C.–370 B.C. and was among the first to suggest the idea of atoms?
Atomos
Democritus
Dalton
Thomson
18
Isotopes of the same element have different
atomic numbers.
positions on the periodic table.
chemical behavior.
mass numbers.
19
Which model of the atom is thought to be true?
The nucleus is made of protons, electrons, and neutrons.
Protons, electrons, and neutrons are throughout the atom
Electrons occupy almost all the volume of the atom
The nucleus is made of electrons and protons.
20
How is the number of neutrons in the nucleus of an atom calculated?
Add the mass number to the number of electrons.
Add the number of electrons and protons together.
Subtract the number of electrons from the number of protons.
Subtract the number of protons from the mass number.
21
What is the mass of an electron?
0.1840
1840 / 1
1/1840
1840
22
What unit is used to measure weighted average atomic mass?
Angstrom
Gram
Mass Number
AMU
23
Which of the following is correct concerning subatomic particles?
The electron was discovered by Goldstein in 1886.
Cathode rays were found to be made of protons.
The neutron was discovered by Chadwick in 1932.
The proton was discovered by Thomson in 1880.
24
About how many more times massive is a proton than an electron?
1840
1/1840
1840 / 1
0.1840
25
What is the charge of an electron? Pick the best answer!!!
Positive
Negative 1
Negative
Positive 1
26
an atom with atomic number 50 and mass number 125 contains
120 neutrons, 50 protons, 75 electrons
50 protons, 50 electrons, 75 neutrons
75 electrons, 50 protons, 50 neutrons
70 neutrons, 75 protons, 50 electrons
27
Using the periodic table, determine the number of neutrons in O.
4
8
24
16
28
What is the charge of a proton? Pick the best answer!!!
Positive 1
Positive
Negative
Negative 1

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