stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
Ch 4 Atomic Structure - Chemistry Flashcards | StudBud
Explore
/
Ch 4 Atomic Structure - Chemistry
Ch 4 Atomic Structure - Chemistry
25 terms
·
StudBud Administration
·
1,631 plays
Ch 4 Atomic Structure, Chemistry
Flashcards
25 cards
F
Practice quiz
P
Host live
L
Questions
25
Answers
1
Which of the following equals one atomic mass unit?
the mass of 1 electron
the mass of 1 helium-4 atom
1/12 the mass of 1 carbon-12 atom
the mass of 1 carbon-12 atom
2
Which was originally part of Daltons atomic theory but had to be revised about a century later?
Atoms of different elements can combine in whole # ratios.
Atoms are tiny indivisible particles.
Atoms of the same element are identical.
Compounds are made by combining atoms.
3
The smallest particle of an element that still retains the properties of that element is a(n)
atom
electron
neutron
proton
4
What does the number 84 in the name krypton-84 represent?
twice the number of protons
the mass number
the sum of the protons & electrons
the atomic number
5
Why did J. J. Thomson reason that electrons must be a part of the atoms of all elements?
Charge-to-mass ratio of electrons was the same for all gases
An electron is 2000 times lighter than a hydrogen atom.
Cathode rays can be deflected by magnets.
Cathode rays are negatively-charged particles.
6
Dalton's atomic theory included which idea?
Individual atoms can be seen with a microscope.
All atoms of all elements are always the same size.
Atoms of the same element are always identical.
Atoms of different elements always combine in 1-to-1 ratios.
7
How many protons, electrons and neutrons does an atom with atomic # 50 and mass # 125 contain?
70 neutrons, 75 protons, 50 electrons
120 neutrons, 50 protons, 75 electrons
50 protons, 50 electrons, 75 neutrons
75 electrons, 50 protons, 50 neutrons
8
Which of the following is NOT a part of Dalton's atomic theory?
Atoms of the same element are identical.
Atoms are always in motion.
Atoms that combine do so in simple whole number ratios.
All elements are composed of atoms.
9
What unit is used to measure weighted average atomic mass?
amu
angstrom
gram
nanogram
10
An element has an atomic number of 76. The # of protons and electrons in a neutral atom of this
152 protons and 76 electrons
76 protons and 76 electrons
76 protons and 0 electrons
38 protons and 38 electrons
11
Which of the following was NOT among Democritus's ideas?
Matter consists of tiny particles called atoms.
Atoms are indestructible.
Atoms retain their identity in a chemical reaction.
Atoms are indivisible.
12
What is the relative mass of an electron?
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
1/1840 the mass of a neutron + proton
13
Isotopes of the same element have different
numbers of electrons.
numbers of protons.
atomic numbers.
numbers of neutrons.
14
All atoms of the same element have the same
mass numbers.
mass.
number of neutrons.
number of protons.
15
Which of the following isotopes has the same number of neutrons as phosphorus-31?
c.
a.
b.
d.
16
The particles that are found in the nucleus of an atom are
electrons only
protons only
neutrons and electrons
protons and neutrons
17
In which of the following is the number of neutrons correctly represented?
d.
c.
a.
b.
18
How do the isotopes hydrogen-1 and hydrogen-2 differ?
hydrogen-2 has one neutron; hydrogen-1 has none
hydrogen-2 has one proton; hydrogen-1 has none
hydrogen-2 has two protons; hydrogen-1 has one
hydrogen-2 has one more electron than hydrogen-1
19
The atomic mass of an element is the
weighted average of masses of the isotopes of the element
average of the mass # and the atomic # for the element.
total mass of the isotopes of the element.
total # of subatomic particles in it's nucleus
20
Who conducted experiments to determine the quantity of charge carried by an electron?
Millikan
Dalton
Rutherford
Thomson
21
Which of the following statements is NOT true?
Protons have a positive charge.
The nucleus of an atom is positively charged.
Electrons have a mass of 1 amu.
Neutrons are located in the nucleus.
22
Which of the following statements is NOT true?
The nucleus of an atom has a positive charge.
Atoms of the same element can have different masses.
Atoms of isotopes of an element have different #s of protons
Atoms are mostly empty space.
23
The mass number of an element is equal to
the total number of protons and neutrons in the nucleus.
less than twice the atomic number.
a constant number for the lighter elements.
the total number of electrons in the nucleus.
24
The atomic number of an element is the total number of which particles in the nucleus?
neutrons
protons
protons and neutrons
electrons
25
The sum of the protons and neutrons in an atom equals the
nucleus number
mass number
atomic number
atomic mass
