Which of the following was originally a part of Dalton's theory, but was recently revised?

atoms are tiny indivisible particles

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

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

Which of the following is correct concerning subatomic particles?

the neutron was discovered by Chadwick in 1932

Because of Rutherford's discovery of the nucleus, which model of the atom is thought to be true

electrons are distributed around the nucleus, occupy volume

Why do chemists use relative masses of atoms compared to a reference isotope?

actual masses of atoms are very small

Which of the following is necessary to calculate the atomic mass of an element?

masses of each isotope of the element

What is the relative mass of an electron?

1/1840 the mass of a hydrogen atom

Which of the following statements is NOT true?

electrons are negatively charged, have a mass of 1 amu

Which of the following equals one atomic mass unit?

one-twelfth the mass of one carbon-12 atom

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Chem Ch 4-Atomic Structure

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Answers

1
Which of the following is NOT a part of Dalton's atomic theory?
all elements are composed of atoms
atoms of the same element are identical
atoms that combine do so in simple whole number ratios
atoms are always in motion
2
What is a negatively charged subatomic particle called?
nucleus
electron
neutron
proton
3
What is the total number of protons and neutrons in the nucleus of an atom referred to as?
mass number
atomic mass unit
atomic number
atomic mass
4
Which of the following was originally a part of Dalton's theory, but was recently revised?
atoms of the same element are identical
compounds are made by combining atoms
atoms of different elements can combine
atoms are tiny indivisible particles
5
The sum of the protons and neutrons in an atom equals the _____.
mass number
atomic number
atomic mass
nucleus number
6
What is a positively charged subatomic particle called?
proton
neutron
electron
nucleus
7
How do isotopes hydrogen-1 and hydrogen-2 differ?
hydrogen-2 has one neutron; hydrogen-1 has none
hydrogen-2 has one more electron than hydrogen-1
hydrogen-2 has two protons; hydrogen-1 has one
hydrogen-2 has one proton; hydrogen-1 has none
8
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
9
Because of Rutherford's discovery of the nucleus, which model of the atom is thought to be true
nucleus is made of electrons and protons
nucleus is made of protons, electrons and neutrons
electrons are distributed around the nucleus, occupy volume
subatomic particles are evenly distributed
10
Why do chemists use relative masses of atoms compared to a reference isotope?
actual masses of protons, electrons & neutrons are unknown
actual masses of atoms are very small
actual mass of an electron is very large comparatively
the number of subatomic particles in elements varies
11
Which of the following is necessary to calculate the atomic mass of an element?
masses of each isotope of the element
the atomic number of the element
the atomic mass of carbon-12
relative masses of the element's protons and neutrons
12
What is the relative mass of an electron?
1/1840 the mass of a neutron + proton
1/1840 the mass of an alpha particle
1/1840 the mass of a C-12 atom
1/1840 the mass of a hydrogen atom
13
Which of the following statements is NOT true?
protons have a positive charge
neutrons are located in the nucleus of an atom
electrons are negatively charged, have a mass of 1 amu
the nucleus of an atom is positively charged
14
The number of protons in the nucleus of an atom is also known as what?
mass number
atomic mass
atomic number
isotope
15
The particles found in the nucleus of an atom are __________.
neutrons and electrons
protons and neutrons
protons and electrons
electrons only
16
Isotopes of the same element have different _______.
number of neutrons
number of protons
number of electrons
atomic numbers
17
An element has atomic number 76. What is the number of protons and electrons?
76 protons and 0 electrons
76 protons and 76 electrons
152 protons and 76 electrons
38 protons and 38 electrons
18
All atoms of the same element have the same ________.
mass numbers
mass
number of protons
number of neutrons
19
Which of the following equals one atomic mass unit?
one-twelfth the mass of one carbon-12 atom
the mass of one helium-4 atom
the mass of one carbon-12 atom
the mass of one electron
20
What does the number 84 in the name krypton-84 represent?
the mass number
the atomic number
the sum of the protons and electrons
twice the number of protons

Chem Ch 4-Atomic Structure Flashcards | StudBud