Worksheetsmass number and atomic number
Total questions: 19
Worksheet time: 13mins
How many protons are in a sodium atom, Na? (tap to enlarge the periodic table)
Sodium has 1 proton.
Sodium has 3 protons.
Sodium has 11 protons
Atoms of the same element which have a different number of neutrons are called _________________.
ions
isotopes
quarks
molecules
Which subatomic particle has a negative charge in the atom?
proton
neutron
electron
quark
How many neutrons does an atom of the isotope Neon-22 have? (tap to enlarge the image)
12
10
22
20
If an atom has 10 electrons, how many protons does it have?
0
1
10
5
What is the Atomic Number of this Element
7
3
4
1
What is the number of protons in Magnesium atom ?
12
24
23
8
What is the number of electrons in chlorine atom ?
35
11
18
17
What does the 1.00794 stand for?
mass number
atomic number
average atomic mass
number of protons
What is the atomic number of this atom shown in the Bohr model?
11
12
13
can't be determined
What is the mass number of the atom shown in the Bohr model?
11
12
23
Can't be determined
Most of the mass of an atom is found in the ______.
nucleus
proton
electron cloud
isotope
