Atomic structure Flashcards
1
Q
What are alpha particles
A
Subatomic particle comprising two protons and two neutrons (the same as a helium nucleus).
2
Q
Proton
A
Is a positively charged particle.
Found in nucleus
3
Q
Neutron
A
Is a neutral particle.
Found in nucleus
4
Q
Electron
A
Is a negatively charged particle.
Orbits the nucleus (shell)
5
Q
Atomic number=
A
Number of protons
6
Q
Masss number=
A
Number of neutrons plus protons
7
Q
Is mass number at the top or bottom?
A
Top
8
Q
Is atomic number on the top or bottom?
A
Bottom
9
Q
What are Isotopes
A
Same number of protons, different number of neutrons
10
Q
Who discovered the idea of the atom
A
Greek philosopher Democritus
1st person to to think of atoms as small particles that cannot be cut or divided.
11
Q
A
