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Atoms
Test Description: Test
Instructions: Answer all questions to get your test result.
1) He discovered the electron
A
J.J. Thomson
B
Ernst Rutherford
C
John Dalton
D
Niels Bohr
2) The mass of an electron is
A
Larger than the mass of a proton
B
Insignificant compared to the mass of a proton.
C
Slightly smaller than the mass of a proton
D
The same as 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
The number of particles in its nucleus
B
The number of electrons
C
The number of protons in its nucleus
D
Its mass
5) He discovered the atomic nucleus
A
Niels Bohr
B
Ernst Rutherford
C
J.J. Thomson
D
John Dalton
6) Positive ions result when an atom
A
loses electrons
B
gains electrons
C
gains protons
D
loses protons
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 number of protons it contains
C
The total number of particles in its nucleus
D
The total number of subatomic particles it contains
10) Isotopes are
A
Atoms of different elements with the same mass number
B
Atoms of the same element with different mass numbers
C
Atoms of different elements with the same number of protons
D
Atoms of the same element with different ionic charges
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
protons and neutrons
B
empty space
C
electrons
D
air
13) Which of the following elements is a metalloid?
A
Ge
B
Ga
C
Sn
D
Al
14) The plum pudding model of the atom was proposed by
A
Niels Bohr
B
John Dalton
C
J.J. Thomson
D
Ernst Rutherford
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 5 protons
D
All boron atoms have a mass of 10.8.
16) Which is not a tenant of Dalton's atomic theory.
A
In a chemical reaction atoms are rearranged
B
Atoms combine in whole number ratios to form compounds
C
Atoms cannot be created or destroyed.
D
Atoms are composed of three different subatomic particles
17) A pure substance
A
cannot be obtained by separating a mixture
B
cannot be broken down into simpler substances by any means
C
only contains one kind of atom
D
may be a compound or an element
*select an answer for all questions
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