PERIODic table
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give the formula of sodium sulfide
na2s
explain in terms of electronic configuration why neon is unreactive
it doesnt lose or gain or share electrons,because its outermost shell is full
how are elements arranged in the periodic table
increasing atomic number
why argon is least reactive element
doesnt lose or gain electrons or shared electron
symbol of silver
ag
state a phisical proprety shows na is metal
as its good conductor of electricity
suggest why argon is a more suitable gas that air to use in light bulb
as argon provide an inert atmosphere to protect the filement from burning as argon cant lose gain or shared electrons
name 2 ellements in period 2 that form acidc oxide
carbon,nitrogen
How many elements in periodic table
116 element
How many periods and group in periodic table
7 period 8 group
Same period means same number of_____
Energy level
Why numbering electrons in same period have same number of energy level?
As number increase by one which lead to periodicity in chemical properties across period
Why elements in same group have same chemical properties?
As same number of electrons in valence shell equal group’s number
Why hydrogen not place in periodic table?
As it’s smallest atom,unique, not fit easily,properties is distinctive
What’s meant by period’s number
Number of shells filled with electrons
What is meant by a group’s number
Number of electrons in outermost shell
Example of gas elements
Hydrogen,nitrogen,oxygen fulorine, chlorine,noble gas
Example of liquid element (metal)
Mercury
Example of liquid non-metal
Bromine
Why atoms of all elements tend to combine with each other?
In order to get electronic structure nearest noble gas
Metal react with non-metal gives____
Ionic compound
Non-metal react with non-metal gives____
Covalent compound
What is meant by valence shell
Number of electrons can be lost,gained,shared to attain stable electronic structure
Why reactivity of metals increase down group?
As valence electron get further from nucleus