Define atomic mass, molecule, atomicity, valency, mole concept
Answers
• Molecule
It is the smallest particle of an eleme4It- or a dolnpound which can wxist independently.
• Molecules of an element constitutes same type of atoms. 1.w
• Molecules may be monoatomic, di-atomic or polyatomic. IT .
• Molecules of compounds join together in defmite proportionsrand constitutes different type of atoms.
• Atomicity
The number of atoms constituting a Molecule is known as its atomicity.
• Valency
The combining capacity of an element is known as its valency: Valency is used to fmd out how atom of an element will combine with the atom of another element to form a chemical compound.
(Every atom want, to become stable, to do so it may loose, gain or share electrongs.
(i) If an atom consists of 1, 2 or 3 electrons in its valgncesI ell then its valency is 1, 2 or 3 respectively,
(ii) If an atom consists of 5, 6 or 7 electrons in the outermost shell, then it will gain 3, 2 or 1 electron respectively and its valency will be 3, 2 or 1 respectively.
(ii) If an atom has 4 electrons in the outermost shell than it will she this electron and hence its valency will be 4.
(iv) If an atom has 8 electrons in the outermost shell then its valency is 0.
Definition of mole: It is defined as one mole of any species (atom, molecules, ions or particles) is that quantity in number having a mass equal to its atomic or molecular mass in grams.
1 mole = 6.022 × 1023 in number
Dalton’s Atomic Theory
1. Every matter is made up of very small or tiny particles called atoms.
2. Atoms are not divisible and cannot be created or destroyed in a chemical reaction.
3. All atoms of a given element it are same in size, “mass and chemical properties.
4. Atoms of different elements are different in size, mass and chemical properties.
5. Atoms combine in the ratio of small whole number to form compounds.
6. The relative number and kinds of atoms are constant in a given compound. 9
Answer:
Molecule
It is the smallest particle of an eleme4It- or a dolnpound which can wxist independently.
• Molecules of an element constitutes same type of atoms. 1.w
• Molecules may be monoatomic, di-atomic or polyatomic. IT .
• Molecules of compounds join together in defmite proportionsrand constitutes different type of atoms.
• Atomicity
The number of atoms constituting a Molecule is known as its atomicity.
• Valency
The combining capacity of an element is known as its valency: Valency is used to fmd out how atom of an element will combine with the atom of another element to form a chemical compound.
(Every atom want, to become stable, to do so it may loose, gain or share electrongs.
(i) If an atom consists of 1, 2 or 3 electrons in its valgncesI ell then its valency is 1, 2 or 3 respectively,
(ii) If an atom consists of 5, 6 or 7 electrons in the outermost shell, then it will gain 3, 2 or 1 electron respectively and its valency will be 3, 2 or 1 respectively.
(ii) If an atom has 4 electrons in the outermost shell than it will she this electron and hence its valency will be 4.