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Vera_Pavlovna [14]
3 years ago
11

How to remember the first 20 elements of the periodic table?

Chemistry
2 answers:
REY [17]3 years ago
6 0

The way the brain works is that you learn from repetition, the more you do something the better you get at it. So the more you review the first 20 elements on the periodic table, the more often you'll be able to remember it until you're about to recount them without hardly thinking of it.

My advice to you is to grab some pieces of paper. Cut them up into sixths until you have twenty of them, then write down on each smaller piece of paper the numbers 1 up to 20. Then on the other side of the paper, write down the element. Do this in accordance to their position on the periodic table. Then spend some time guessing as to what element is on the other side of the numbered paper. You'll start guessing, "the first element is Hydrogen. The second element is Helium." And so on. Rinse and repeat until you're able to guess the element depending on its placement on the periodic table. Good luck!

EastWind [94]3 years ago
5 0

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

Hope this helps :)

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:) I hope this helped! :)

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The formula ca(no3)2 tells us that one formula unit of this compound is composed of ________ calcium atoms, ________ nitrogen at
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Answer:- The formula Ca(NO_3)_2 tells us that one formula unit of this compound is composed of one calcium atom, two nitrogen atoms, and six oxygen atoms.

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When we have subscripts inside and outside the parenthesis then they are multiplied and the outside subscript is considered for all the atoms present inside the parenthesis.

Here, for the given chemical formula, the subscript of N is 1 and the subscript present outside is 2. So, 1 x 2 = 2 and for oxygen, 3 x 2 = 6

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3 years ago
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The sp3 hybridization has what percent s character and what percent p character respectively?
Salsk061 [2.6K]

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The sp³ orbital hybridization has 25% s-character and 75% p-character.

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The<u> four sp³ hybridized orbitals</u> are formed by the mixing of <u>one s orbital and three p orbitals.</u>

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and p-character in a sp³ hybridized orbital = (3÷4)×100 = 75%

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