Question

1. What is the criteria for giving symbols to the elements?
2. State the modern definition of valency.
3. How to name the ions of element having variable valency?
4. Give to examples for each of acidic and basic radicals.
5. Define a) Chemical formula b) chemical equation.

Answer 1

Answer:

1.All of these 118 elements on the periodic table have chemical symbols represented by the first letter or two of the name of the element. If the chemical symbol has two letters the first letter is always capitalized and the second letter is written in lowercase.

2.Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how

many electrons are in the outer shell. Group number.

3.Elements with Variable Valency

The element that exhibits lower valency will be suffixed with “ous”. While the element that exhibits higher valency will be suffixed with “ic”.

Fe (Iron): 3d6 4s2

Element: Electronic Configuration

4.Common Examples: Soap, toothpaste, bleach, cleaning agents, limewater, ammonia water, sodium hydroxide. Acids and bases in aqueous solutions will conduct electricity because they contain dissolved ions. Therefore, acids and bases are electrolytes. Strong acids and bases will be strong electrolytes.

ACIDS: BASES

taste sour: taste bitter

5.a)A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus and minus signs

b)A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae, wherein the reactant entities are given on the left-hand side and the product entities on the right-hand side. ... The first chemical equation was diagrammed by Jean Beguin in 1615.

Explanation:

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