Atomic Models
Protons and Neutrons
Ionic Compounds
Ions
Anything Goes
100
This scientist proposed that atoms of elements could combine in whole number ratios to form compounds.
John Dalton
100
True or false:
Protons and electrons have opposite charges but the same mass.
False
100
In an ionic compound the positive and negative charges must be
equal
100
A cation has what charge?
Positive
100
Of the following elements which exists as a diatomic?
Helium, Sulfur, Iodine, Sodium, Tin
Iodine
200
J. J. Thomson discovered the electron using this famous experiment.
The cathode ray experiment
200
These two atoms are called
40/20Ca
39/20Ca
Isotopes
200
Atoms in group 13 on the periodic table form ions with this charge.
+3
200
An atom can form a cation by
Losing electrons
200
Name the element in period 5 on the periodic table that is an alkaline earth metal.
Strontium
300
This model of the atom is called
Plum pudding model
300
The function of neutrons in the nucleus is to
Hold the positively charged protons together
300
The formula of the compound formed between rubidium and iodine is
RbI
300
How many electrons does a sulfide ion contain?
18
300
The formula of the compound formed between sodium and nitrogen is
Na3N
400
In the gold foil experiment, Rutherford expected the alpha particles to
Go straight through the gold foil
400
Two important things are determined solely by the nucleus of an atom. What are they?
Its identity and its mass.
400
The formula of the compound formed between barium and phosphorus is
Ba3P2
400
Atoms in this group on the periodic table do not form any ions. Name the group.
Noble gases
400
Elements that border the staircase line on the periodic table are called
Metalloids
500
Prior to Democritus Greek philosophers thought that matter was composed of these four components.
Earth, water, fire, and air
500
The following atom has how many neutrons?
114/49 In
65
500
When an ionic compound dissolves in water its ions are free to move. This permits the solution to
Conduct electricity
500
Which of these atoms has 18 electrons?
20/17Cl^-
39/19K^+
40/18Ar
All have 18 electrons
500
A compound with the following formula contains how many oxygen atoms?
ZrO(NO3)2
7