An atom of gallium has an atomic number of 31 and a mass number of 70. Give the number of electrons, protons and neutrons in the atom.

Atoms

Quiz
•
Science
•
10th Grade
•
Hard

Jonathan Gois
Used 1+ times
FREE Resource
99 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
31 electrons, 31 protons, 39 neutrons
31 electrons, 31 protons, 40 neutrons
31 electrons, 32 protons, 39 neutrons
32 electrons, 31 protons, 39 neutrons
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is an element?
A substance that cannot be broken down into simpler substances
A mixture of two or more substances
A compound made of different atoms
A type of molecule
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Atoms can have different numbers of protons, neutrons, and electrons. What determines the type of atom?
The number of protons
The number of neutrons
The number of electrons
The number of protons and neutrons
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
An atom with one proton in its nucleus is:
hydrogen
helium
lithium
beryllium
5.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Which of the following is a correct symbol for an element?
C for carbon
O for oxygen
Mg for magnesium
All of the above
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A substance consists of atoms which all have the same number of protons and electrons but different numbers of neutrons. Explain why this substance is an element.
Because it has a unique atomic number.
Because it has isotopes.
Because it is a compound.
Because it has a unique atomic mass.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calculate silicon's relative atomic mass to 1 decimal place.
28.1
28.0
28.2
28.3
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