Atoms Question Preview (ID: 35307)
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He discovered the electron
a) John Dalton
b) J.J. Thomson
c) Ernst Rutherford
d) Niels Bohr
The mass of an electron is
a) The same as the mass of a proton.
b) Larger than the mass of a proton
c) Slightly smaller than the mass of a proton
d) Insignificant compared to the mass of a proton.
The number of neutrons in an atom is
a) Equal to the number of electrons
b) Equal to the number of protons
c) Variable
d) Equal to the number of protons plus electrons
The identity of an atom is determined by
a) Its mass
b) The number of particles in its nucleus
c) The number of protons in its nucleus
d) The number of electrons
He discovered the atomic nucleus
a) John Dalton
b) J.J. Thomson
c) Ernst Rutherford
d) Niels Bohr
Positive ions result when an atom
a) loses electrons
b) gains electrons
c) loses protons
d) gains protons
In a compound formed between ions
a) The number of cations must equal the number of anions
b) The number of positive charges must equal the number of negative charges
c) There must be only non-metals
d)
If an atom is a halogen it will form a
a) +1 charged ion
b) +2 charged ion
c) -1 charged ion
d) -2 charged ion
The mass number of an atom is
a) Its mass in grams
b) The number of protons it contains
c) The total number of particles in its nucleus
d) The total number of subatomic particles it contains
Isotopes are
a) Atoms of different elements with the same number of protons
b) Atoms of different elements with the same mass number
c) Atoms of the same element with different mass numbers
d) Atoms of the same element with different ionic charges
An ion of a certain element has 36 electrons. Which of the following elements can it not be?
a) Selenium
b) Bromine
c) Krypton
d) Rubidium
The volume of an atom is mostly made up of
a) protons and neutrons
b) air
c) empty space
d) electrons
Which of the following elements is a metalloid?
a) Al
b) Ga
c) Ge
d) Sn
The plum pudding model of the atom was proposed by
a) John Dalton
b) J.J. Thomson
c) Ernst Rutherford
d) Niels Bohr
The average atomic mass of boron atoms is 10.8. Which of the following is not true?
a) All boron atoms have 5 protons
b) There are more boron atoms with six neutrons than with five
c) There are more boron atoms with a mass number of 11 than with 10.
d) All boron atoms have a mass of 10.8.
Which is not a tenant of Dalton's atomic theory.
a) Atoms cannot be created or destroyed.
b) Atoms combine in whole number ratios to form compounds
c) Atoms are composed of three different subatomic particles
d) In a chemical reaction atoms are rearranged
A pure substance
a) only contains one kind of atom
b) cannot be broken down into simpler substances by any means
c) may be a compound or an element
d) cannot be obtained by separating a mixture
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