Water=h20
=2.0*10^22 molecules
Answer:
They all move at the same speed in a vacuum.
Explanation:
All electromagnetic wave travel with the same speed in vacuum. This speed is equivalent to 3x10^8m/s
All electromagnetic wave have different frequencies and wavelengths. The frequency and wavelength are in inverse proportionality i.e as the frequency of a wave increase, its wavelength decreases. The same is also applicable to the energy of waves. Each electromagnetic wave have different energy.
Answer:
The Symbols of elements is given by :
IUPAC : International Union Of Pure and Applied Chemistry .
Its is the Universally recognuised organisation which works on Chemical nomenclature and terminology.
Explanation:
According to IUPAC the elements are named according to mythological concept of country ,mineral , place , property and scientist.
Ex:Copper name comes from the old english word Cyprus.
Rules of Naming elements :
1. The first Alphabet of the element is always Capital.Example:-
Sodium : Na not ''na'
2. The second alphabet is always small .Example
Sodium : Na not ''nA' or NA
3.For most of the elements ,The symbol of the element comes from the <u>first two words.</u>
Example : Hydrogen : H
Helium : He
Copper : Cu
Rules for naming elements having mass> 100
1. The names are derived directly from the atomic number .
Ex : 0 = nil 1= un 2=bi 3=tri
2. The name always ends with ''ium''
For example :
102 = Unnilbium
The correct answer is 2.99 helium atoms.
I hoped this helped!
