Size And Mass Of Atoms Flashcards
1
Q
What is the radius of an atom?
A
About 0.1 nm (1 × 10-10 m).
2
Q
How does the nucleus radius compare to the atom’s radius?
A
Less than 1/10,000; about 1 x 10-14 m.
3
Q
Where is almost all of the mass of an atom located?
A
In the nucleus.
4
Q
Provide the relative masses of protons, neutrons, and electrons.
A
Proton: 1, Neutron: 1, Electron: Very small.
5
Q
What is the sum of protons and neutrons in an atom called?
A
Mass number.
6
Q
Can atoms of the same element have different numbers of neutrons?
A
Yes, and they are called isotopes.
7
Q
What should students be able to calculate?
A
Numbers of protons, neutrons, and electrons given atomic number and mass number.
8
Q
What should students relate regarding atoms?
A
Size and scale to objects in the physical world.
