An atom is electrically neutral because

The numbers of protons and electrons equal

Dalton’s atomic theory helped to explain the law of conservation of mass, it stated that atoms

Could not be created or destroyed

the atomic number of oxygen, 8, indicates

protons in the nucleus of an oxygen atom

The behavior of cathode rays produced in a glass tube led scientists to conclude that the rays

Were composed of negatively charged particles

The average atomic mass of an element is

the weighted average of all naturally occurring isotopes

studbud

Chemistry test chapter 3

15 termsStudBud Administration577 plays

Review game for Mrs. Woodruff's Pre-AP chemistry class

Flashcards15 cardsFPractice quizPHost liveL

Questions 15

Answers

1
The most common form of hydrogen has
one neutron
two neutrons
no neutrons
three neutrons
2
the total number of protons and neutrons is
atomic number
number of neutrons
Avogadro's number
mass number
3
An atom of potassium has 19 protons and 20 neutrons. Its mass number is
9
20
19
39
4
A nuclear particle that has about the same mass as a proton, but no electrical charge
Isotope
Nuclide
Neutron
Electron
5
An atom is electrically neutral because
neutrons balance the protons and electrons
The numbers of protons and neutrons equal
The numbers of protons and electrons equal
Nuclear forces stabilize the charges
6
the atomic mass listed on the periodic table is the
average atomic mass
mass number of the most abundant isotope.
relative atomic mass of the most stable radioactive isotope
relative atomic mass of the most abundant isotope
7
Who discovered the nucleus by bombarding gold foil with positively charged particles?
Dalton
Chadwick
Bohr
Rutherford
8
Dalton’s atomic theory helped to explain the law of conservation of mass, it stated that atoms
Could not be created or destroyed
All had the same mass
Were invisible
Could not combine
9
the atomic number of oxygen, 8, indicates
energy levels in the oxygen atom's nucleus
protons in the nucleus of an oxygen atom
neutrons outside the oxygen atom's nucleus
oxygen nuclides
10
the relative atom mass of an atom can be found by comparing the mass of the atom to
one atom of carbon- 12
one atom of hydrogen-1
a proton
uranium-235
11
Isotopes are atoms of the same element that have different
masses
numbers of protons
numbers of electrons
principal chemical properties
12
Which feature of Dalton's atomic theory is different from modern atomic theory?
atoms cannot be subdivided
atoms cannot be rearranged in chemical ratios
atoms combine in whole-number ratios
atoms cannot be destroyed
13
The behavior of cathode rays produced in a glass tube led scientists to conclude that the rays
Were not composed of matter
Were composed of negatively charged particles
Were composed of positively charged particles
Were composed of uncharged particles
14
The average atomic mass of an element is
the weighted average of all naturally occurring isotopes
the same as the atomic number
the mass of one isotope of the element
the sum of the number of neutrons and protons
15
helium-4 and helium-3 are
isotopes
compounds
nuclei
different elements

Chemistry test chapter 3 Flashcards | StudBud