5.1.1.5 size and mass of atoms Flashcards
1
Q
Atoms are very small. What is their radius?
A
0.1 nm ( 1 x 10 to the power of -10 m)
2
Q
The radius of a nucleus is less than _/______ of that of the atom.
A
1 / 10 000
3
Q
Almost all of the mass of an atom is the _______.
A
Nucleus
4
Q
What is the mass of protons and neutrons?
A
1
5
Q
What is the mass of electrons?
A
Very small ( almost 0 )
6
Q
Atoms of the same element can have different numbers of neutrons; these atoms are known as _______ of that element.
A
Isotopes
7
Q
A
