C8- Periodic Table Flashcards
Define Periodic Table
an arrangement of elements in periods and groups and in order of increasing proton number/ atomic number
What is the similarity between the electronic configuration of the elements in the same group
They have the same number of electrons on the outer shells
What is the trend of reactivity down a metal group
More reactive as it is easier to lose electrons- the attraction between the nucleus and electrons is weaker due to increasing distance
What is the reactivity trend going down a non-metal’s group
They are less reactive as it is harder to attract electrons- the attraction between electrons and nucleus is weaker dure to increasing distance
What is group 1’s name?
Alkali metals
What are the properties of the Alkaline group? (4)
- relatively soft
- increases in density
- decreases in melting point
- increases in reactivity with water
What are the group 7 non-metals called?
The Halogens
What are the properties of the Halogen group? (4)
- non-metals
- diatomic
- increases in density
- decreases in reactivity
What is the appearance of halogens at room temp and pressure? (3)
Chlorine- pale yellow green (gas)
Bromine- red brown (liquid)
Iodine- grey black (solid)
What is displacement? (halogens and other halide ions)
The more reactive halogen displaces the less reactive one- the solution color changes to that of the displaced halogen
What are the properties of Transition metals?
- have high densities
- have high melting points
- form colored compounds
- act as catalyst as elements and in compounds
What are the group 8 metals called?
Noble Gases
What are the properties of a noble gas?
- Unreactive
- monoatomic gases
Where on the periodic table are the metals?
Left side
Where on the periodic table are the non-metals?
Right side
Where on the periodic table are the transition metals?
In the middle
Describe the change from metallic to non-metallic across a period.
The valence for metals is 1-2, while non-metals are 6-7 valence electrons. The tendency to lose electrons decreases.
Why do elements in the same group share similar properties?
all elements in a group have similar chemical properties because they have the same valency and number of outer shell electron.
Give an example of a Alkali element
Lithium, sodium, potassium, rubidium
Give an example of a Halogen element
Fluorine, chlorine, bromine, iodine, astatine
What is a halide ion
A halogen atom with a negative charge
Define valence electrons
The number of outer shell electrons
Define valency
The number of electrons it’s atom loses, gains or shares to form a compound
