The tendency of an element to react is closely related to?
The number of valence electrons
100
Compared to Group 2A elements, Group 6A elements have more or less valence electrons?
more valence electrons
100
What are the most reactive elements from Group 1A?
cesium
100
A member of the boron family has three valence electrons, while a member of the nitrogen family has?
five
100
In a periodic Table, a set of properties repeats from?
row to row
200
Which element is the most reactive out of Group 7A……Flourine, Bromine, Iodine and chlorine?
Flourine
200
Mendeleev gave the name eka-aluminum to a(an)?
an unkown element that he predicted would have similar properties than aluminum
200
Mendeleev arranged the known chemical elements in a table according to?
atomic masses
200
As you move from left to right across a period, the number of valence electrons?
increases
200
What are the differences between periods and columns in a periodic table?
periods go left and right, column up and down, periods arranged by atomic number and columns arranged by properties
300
Answer True or False for these 3 elements (Flourine, Chlorine, Iodine)
Are they all halogens?
Do they react easily with metals/
Are they similar to noble gases?
Are they all nonmetals?
True
True
False
300
A member of the boron family has three valence electrons, while a member of the nitrogen family has?
five
300
Atoms of the most reactive elements tend to have?
one or seven valence electrons
300
Two highly reactive elements in the period 2 are the metal lithium and?
flourine
300
The unit for atomic mass is?
AMU
400
Moving from left to right across a row of the periodic table which of the following values increases by exactly one from element to element?
Atomic Number
400
The usefulness of Mendeleev’s periodic table was confirmed by?
The discovery of elements that fit Mendeleev's predictions
400
The atomic mass of an element is?
a weighted average of the masses of an elements isotopes
400
One twelth the mass of a carbon-12 atom is used to define a (an)?
atomic mass unit
400
What kind of element is tin, copper and cesium?
metal
500
Group 7A of the periodic table contains the?
most reactive nonmetals
500
At room temperature none of the metals in the periodic table can be?
gases
500
The standard on which the atomic mass unit is based is the mass of a?
carbon 12 atom
500
List the properties of metals.
malleable, ductile, conductors of heat, conductors of electric current
500
What kind of element is silicon? Is silicon a better conductor of electric current than sulfur?