The Atom And The Periodic Table Flashcards
1
Q
Vertical rows
A
Rows
2
Q
Horizontal rows
A
Periods
3
Q
Group 1
A
Alkali metals
4
Q
Group 2
A
Alkaline earth metals
5
Q
Group 7
A
Halogens
6
Q
Group 8
A
Noble gases
7
Q
Atomic Number
A
Number of protons in an atom of an element
8
Q
Mass number
A
Number of protons and neutrons in an atom of an element
9
Q
Electrons whiz in
A
Energy levels
10
Q
Isotopes
A
Atoms of the element with different number of neutrons
11
Q
Who arranged the periodic table
A
Dmitri Mandelev by mass of atoms
12
Q
Properties of Group 1
A
Very reactive - stored under oil Low density Soft - can cut with knife Burn in air to form oxides Rect with water - forms hydroxides
13
Q
Properties of group 2
A
Form many compounds
Have a +2 charge
Atoms are smaller than alkaline metals
14
Q
Properties of Group 7
A
Found in bleaches, disinfectants and salt
Non-metals
Form ions with a -1 charge
Highly reactive
15
Q
Group 8
A
Used to make lighted signs, refrigerants and lasers.
Not reactive
