WorksheetsLesson 1 The Atom
Total questions: 5
Worksheet time: 10mins
An atom’s mass number is 210 and its atomic number is 85. How many neutrons does the atom have?
85
125
210
295
Think about a wooden chair and a balloon. What do these two objects always have in common?
Both are made of atoms.
Both have the same mass number.
Both are made of the same kind of atom.
Both are made of the same number of atoms.
Which of the following scientists added negatively-charged particles to the model of the atom?
Niels Bohr
John Dalton
Ernest Rutherford
J. J. Thomson
Calcium is an element. What is the smallest particle of calcium that has all the chemical properties of calcium?
an atom of calcium
a proton from a calcium atom
an electron from a calcium atom
a molecule that contains calcium
The diagram below shows a model of an atom. Which label points to the nucleus?
A
B
C
D
