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Asked by Mragisha

Dec 19, 2014

Tricks to learn atomic masses first 20 elements

The technique to learn atomic masses of elements according to the periodic table?

Answers(4)

Answer

Syeda

Member since Jan 25, 2017

Answer.

The atomic mass is double the atomic number of an element. But it is not applicable for all the elements in the periodic table.

The atomic masses of elements like He, Li, C, N, O, Ne, Si, S, Cl, Ca are double the atomic number.

The atomic masses of elements like Be, B, F, Na, Mg, Al, P, Ar and K are not double the atomic number.

For these elements just double the atomic number and add 1

Angelo

Member since

Happy Henry Lives Beside Boron Cottage, Near Our Friend Nelly Nancy MgAllen. Silly Patrick Stays Close. Arthur kept Carrie

Explanation:
Happy. – H Hydrogen
Henry – He Helium
Lives – Li Lithium
Beside – Be Beryllium
Born – B Boron
Cottage – C Carbon
Near – N Nitrogen
Our – O Oxygen
Friend – F Fluorine.
Nelly – Ne Neon
Nancy – Na Sodium
Mg – Mg Magnesium
Allen – Al Aluminum
Silly – Si Silicon
Patrick – P Phosphorus
Stays – S Sulphur
Close – Cl Chlorine
Arthur – Ar Argon
Kept – K Potassium
Carrie – Ca Calcium

Swathi Ambati

Member since Apr 28, 2014

For your grade you need to remember atomic masses of first 20 elements.

The atomic mass is double the atomic number of an element. But it is not applicable for all the elements in the periodic table.

The atomic masses of elements like He, Li, C, N, O, Ne, Si, S, Cl, Ca are double the atomic number.

The atomic masses of elements like Be, B, F, Na, Mg, Al, P, Ar and K are not double the atomic number.

For these elements just double the atomic number and add 1.

Try to practice every day …..

Aditi Sharma

Member since

Usually element (till calcium) atomic mass is just double of its atomic number like at. no. of oxygen is 8 and its atomic mass is 16. But elements like Li,Be,B,F,Na,Al,P,Cl,Ar &,K has atomic mass = Atomic number * 2 +1

example Al = atomic num. *2 + 1
                   =  13*2+1   = 27 nad this is its atomic mass. 
Thus , you need to remember only these elements like  Li,Be,B etc . and then you can find the atomic mass of these elements easily . { hope u hav learned all the atomic numbers numbers ;) :) ;) }
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