stud
bud
Sign up
Log in
Home
Library
Explore
SAT
More
9/14/22 Atomic Structure Flashcards | StudBud
Explore
/
9/14/22 Atomic Structure
9/14/22 Atomic Structure
22 terms
·
StudBud Administration
·
664 plays
review
Flashcards
22 cards
F
Practice quiz
P
Host live
L
Questions
22
Answers
1
What unit is used to measure weighted average atomic mass?
nanogram
angstrom
amu
gram
2
How many protons and electrons Xenon (Xe) have?
108 protons and 54 electrons
54 protons and 54 electrons
27 protons and 27 electrons
54 protons and 0 electrons
3
What does the number 88 in the name Bromine-88 represent?
The mass #
Twice the number of protons
The atomic #
The sum of the protons and electrons
4
What did the famous "Gold Foil Experiment" help to discover?
There have to be neutrons as well as protons in the nucleus
The atom is mostly empty space
It is possible for an atom to weigh different amounts.
All atoms contain negatively charged particles
5
Which of the following statements is true?
Neutrons are negatively charged and have a mass of 1 amu
Electrons are negatively charged and have a mass of 1 amu
Protons are positively charged and have a mass of 1 amu
Nucleus is positively charged and never has a mass of 1 amu
6
The sum of the protons and neutrons in an atom equals the
nucleus number
Electrons
atomic number
mass number
7
Dalton's atomic theory included which idea?
Atoms of different elements always combine in 1:1 ratios
Atoms of the same element are always identical
Individual atoms can be seen with a microscope
All atoms of all elements are the same size
8
The nucleus of an atom is
negatively charged and has more protons than neutrons
composed of protons and neutrons
negatively charged and has a low density
negatively charged and has a high density
9
The atomic number of an element is the total number of which particles in the nucleus?
electrons
protons and electrons
Protons
neutrons
10
How do the isotopes of sodium-21 and sodium-22 differ?
Sodium 22 has 11 neutrons, sodium-21 has 10
Sodium-22 has 22 protons, sodium 21 has 21
Sodium-22 has 11 protons, sodium-21 has 10
Sodium-22 has one more electron than sodium-21
11
Which discovery did JJ Thomson make that improved upon Dalton's atomic theory?
Atoms contain a tiny, positively charged nucleus
Atoms that combine do so in simple whole-number ratios
Atoms contain tiny, negatively charged electrons
Atoms are always in motion
12
The atomic mass of an element is the
weighted average of masses of the isotopes of the element
total mass of the isotopes of the element
total number of subatomic particles in its nucleus
average of the mass number and atomic number for the element
13
Isotopes of the same element have different
mass numbers
positions on the periodic table
atomic numbers
chemical behavior
14
Which of the following statements is true?
Atoms of isotopes of an element have different # of protons
Atoms of isotopes of an element have different # electrons
Atoms of the same element all have the same mass
Atoms of isotopes of an element have different # of neutrons
15
Which of the following is correct concerning subatomic particles?
The electron was discovered by Goldstein
Cathode rays were found to be made of protons
The proton was discovered by Thomson
the neutron was discovered by Chadwick
16
Which model of the atom according to Rutherford is true?
The nucleus is made up of protons, electrons, and neutrons
Electron distributed around nucleus
the nucleus is made of electrons and protons
Protons,electrons,neutrons are evenly distributed in atoms
17
How were isotopes discovered?
Electron Microscope
Mass Spectrometer
Light Microscope
Scanning Tunneling Microscope
18
Which of the following is necessary to calculate the atomic mass of an element?
Relative masses of the element's protons and neutrons
Masses and relative abundance of each isotope of the element
Atomic mass of carbon-12
Atomic # of the element
19
In which of the following sets is the symbol of the element, # of protons & electrons correct?
K, 19 protons, 39.098 electrons
Cu, 29 protons, 35 electrons
Cl, 35 protons, 35 electrons
Sn, 50 protons, 50 electrons
20
This man lived from 460 BC to 370 BC and was among the first to suggest the idea of atoms.
Thomson
Democritus
Atomos
Dalton
21
Which of the following is true about subatomic particles?
Protons-positively charged and lightest subatomic particle
Electrons-negatively charged and heaviest subatomic particle
Neutrons-no charge and are the lightest subatomic particle
The mass of a neutron nearly equals the mass of a proton
22
All atoms are
Positive: # protons exceeding # electrons
Negative: # electrons exceeding # protons
Neutral: # protons = # electrons which is = to # of neutrons
Neutral: # of protons = # of electrons
