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