Which of these statements is false?

Electrons have a mass of 1 amu.

The number of neutrons in the nucleus of an atom can be calculated by

subtrcting the # of protons from the mass number.

Which of these statements is not true?

Isotopes of an element have different #'s of protons.

An atom of an element with atomic number 48 and mass number 120 contains

48 protons, 48 electrons, and 72 neutrons.

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Chapter 4 Atoms Review

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Questions 20

Answers

1
Negatively charged subatomic particles
proton
neutron
electron
phase
2
Positively charged subatomic particle
moron
proton
neutron
electron
3
Which of these statements is false?
The neutron is found in the nucleus of an atom.
The nucleus of an atom is positively charged.
Electrons have a mass of 1 amu.
Electrons have a negative charge.
4
The number of neutrons in the nucleus of an atom can be calculated by
subtracting the # of protons from the # of electrons.
adding the mass # to the # of protons.
adding together the numbers of electrons and protons.
subtrcting the # of protons from the mass number.
5
The smallest particle of an element that retains its identity in a chemical reaction
neutron
proton
atom
electron
6
Which of these statements is not true?
Atoms of the same elements can have different masses.
Atoms are mostly empty space.
Isotopes of an element have different #'s of protons.
The nucleus of an atom has a positive charge.
7
The weighted average mass of the atoms in a naturally occurring sample of an element
atomic mass
atomic number
atom
atomic mass unit
8
Relative atomic masses are measured in
grams
amus
nanograms
angstroms
9
Which of the following is not a part of Dalton’s atomic theory?
Atoms of the same element are alike
All elements are composed of atoms.
Atoms are always in motion.
Atoms that combine do so in simple whole-number ratios.
10
All atoms of the same element have the same:
atomic mass.
atomic number
number of electrons.
mass.
11
Dalton theorized that atoms are indivisible. Scientists now know that
Atoms aren't identical, they all have the same mass.
Dalton’s theories are completely correct.
atoms are all divisible.
atoms of an element can have different numbers of protons.
12
The sum of the protons and neutrons in an atom equals the
atomic number
number of electrons
atomic mass.
mass number
13
The number 80 in the name bromine-80 represents
none of the above
the atomic number.
the sum of protons and electrons.
the mass number.
14
The number of protons in the nucleus of an element
atoms
atomic number
atomic mass
atomic mass unit (amu)
15
Atoms with the same number of protons but different numbers of neutrons
atoms
isotopes
carbon-14
period
16
1/12 the mass of a carbon-12 atom
atom
atomic mass unit (amu)
atomic number
atomic mass
17
The total number of protons and neutrons in the nucleus of an atom=
atomic number
mass number
proton
isotopes
18
A horizontal row of the periodic table
period
group
horizontal
vertical
19
An atom of an element with atomic number 48 and mass number 120 contains
48 protons, 48 electrons, and 72 neutrons.
120 protons, 48 electrons, and 72 neutrons.
72 protons, 72 electrons, and 48 neutrons.
72 protons, 48 electrons, and 48 neutrons.
20
Subatomic particle with no charge
electron
proton
atom
neutron

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