Atom
What are three things in the definition of an atom?
smallest part of an element, electrically neutral and takes part in a chemical reaction.
What is the periodic table?
An arrangement of chemical elements increasing in atomic number.
Count the number of ions present in MgO.
1 Mg
1 O
acid + base---->
salt + water
pungent odour
Ammonia gas
What is present in the nucleus?
Protons and neutrons
How many horizontal rows are there on the periodic table?
7
Count the number of ions present in CaCl2.
1 Ca
2 Cl
Acid + Oxide ---->
salt + water
rotten eggs
hydrogen sulphide
The order in which electrons fill up a shell is called ____ ___.
Electronic Configuration
How many vertical columns are there?
18
Count the number of ions present in Al2(CO3)3
2 Al
3 C
9 O
Acid + Sulphide ---->
salt + hydrogen sulphide gas
makes a popping sound from a lighting or glowing splint.
hydrogen gas
Sodium has an atomic number of ______.
11
The list of elements found in the middle are called ________.
Transitional elements
Count the number of ions present in 2H2SO4
4 H
2 S
8 O
HCl + NaOH ---->
NaCl + H2O
turns lime water milky white
Carbon dioxide gas
Atomic mass =
# of protons + # of neutrons
Which group is halogens and which group is inert gases?
group 7- halogens
group18(0)- inert
Count the number of ions present in 2HNO3 + 3NaOH
5H 2N 9O 3Na
H2SO4 + CaCO3 ----->
relights a glowing splint
Oxygen gas