Mnemonic Device
- Happy Henry Lives Beside Boron Cottage, Near Our Friend Nelly Nancy MgAllen. Silly Patrick Stays Close. Arthur Kisses Carrie.
- Here He Lies Beneath Bed Clothes, Nothing On, Feeling Nervous, Naughty Margret Always Sighs, " Please Stop Clowning Around " (18 elements)
- How He Likes Bear By Cups Not Overflowing. Although Science Presents Some Clues, Are Kittens Cats?
- Hi, Hello! Little Beryll Brown Cracking Nuts On Friday. Nellie's Naughty Magpie Always Sings Pop Songs Clearly After Killing Cathy.
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 Kisses - K Potassium Carrie - Ca Calcium
Additional Information
the first twenty elements, of the periodic table, with their atomic number
- hydrogen H
- helium He
- lithium Li
- beryllium Be
- boron B
- carbon C
- nitrogen N
- oxygen O
- flourine F
- neon Ne
- sodium Na
- magnesium Mg
- aluminum Al
- silicon Si
- phosphorus P
- sulfur S
- chlorine Cl
- argon Ar
- potassium K
- calcium Ca
Find the average atomic mass
Rules to find the average atomic mass, if the atomic number (Z) is an: Even number except Be (9), Ar (40),
- multiply the atomic number by 2. For example,
-
- Helium atomic number (Z) is the EVEN #2, hence to find the average atomic mass (A) is (Atomic number) multiply by 2 which is 2 x 2 = 4
-
Odd number except H (1), N (14 ), Cl (35.5),
- multiply the atomic number by 2, then add 1. For example,
-
- Lithium atomic number (Z) is the ODD # 3, hence to find the average atomic mass (A ) is (Atomic number) multiply by 2 plus 1, which is 3 x 2 +1 = 7
-
- Boron atomic number (Z) is the ODD # 5, hence to find the average atomic mass (A ) is (Atomic number ) multiply by 2 plus 1, which is 5 x 2 +1 = 11
-
Please remember the exception to the rules:
- Be, Ar, H, N, Cl
Song for the first 20 elements
Many more mnemonics for remembering the elements of the periodic table See https://en.wikipedia.org/wiki/Periodic_table for more information.