Sci Flashcards
1
Q
What is an atom?
A
The smallest unit of matter that has the properties of an element.
2
Q
What is a proton?
A
A positively charged subatomic particle in the nucleus.
3
Q
What is a neutron?
A
A neutral subatomic particle in the nucleus.
4
Q
What is an electron?
A
A negatively charged subatomic particle outside the nucleus.
5
Q
What is the nucleus?
A
The center of an atom, containing protons and neutrons.
6
Q
What is the atomic number?
A
The number of protons that identifies an atom.
7
Q
What is the mass number?
A
The sum of the number of protons and neutrons in an atom.
8
Q
What is a group number?
A
On the periodic table have the same number of Valence electrons
9
Q
What is a period
A
A row on the periodic table
10
Q
What is valence electron?
A
Electrons in the outermost energy shell they determine electrons
