Science Unit Test Flashcards
How is the shape of the table related to the BRD of each element
So that the groups/families have the valence electrons in common with each other
What does the staircase on the periodic table mean
The metaliods
What are the properties of non-metals
Varied colours, not conductive, dull, not magnetic. It could be any of the states
What are the propeties of metals
Silver/gray, conductable, shiny, magnetic, solid (exept mercury)
What are the properties of metaliods
Some properties of metals, some of non-metals
Why is it called the periodic table
The horizontal rows are called ‘periods’
What group are the alakli metals in
1
What group are the alkaline earth metals in
2
what group are the halogens in
17
What group are the noble gases in
18
What’s the difference between the alkali metals and the alkaline earth metals
Alkali metals have one valence electron, whereas alkaline earth metals have two valence electrons. Alkali metals possess a low melting point, whereas alkaline earth metals possess’ high melting point. Alkali metals are more reactive than alkaine earth metals.
What’s the difference between halogens and alkali metals
Halogens are non-metals, alkali metals are metals. Halogens are poor conductors of heat and electricity, alkali metals are good ones.
Why aren’t noble gases reactive
They already have a full valence shell, so there is no need for them to gain any more.
Why are alkali metals reactive
Because they only have one valence electron, and it would be very easy to loose it
Why are halogens reactive
Because they have seven valence electrons, and it’s very close to having a full valence shell
Define isotope
One of two or more forms of an element that have the same number of protons but a different number of neutrons
Define ion
A positively or negatively charged atom or group of atoms. With a different number of electrons.
Define metal
Typically an element that is hard, shiny, malleable, and ductile, and is a good conductor for heat and electricity
Define non-metal
Typically an element that is not hard, shiny, malleable, or ductile, and is not a good conductor for heat and electricity
Define metaliod
An element that shows some properties with metals and some properties with non-metals
Define family/group
A vertical group of elements in the periodic table
Define period
A horizontal row of elements in the periodic table
Define noble gases
Any of the gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18) of the periodic table.
Define ionic compound
A compound made of oppositely charged ions.
