Question

define a-valency b-valanced electrons c-atomic d-atomic mass e- isotypes f-isotopes
me sry for my spellings.

Answer 1

Explanation:

(a) (i). Valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules.

(ii). Atomic size is determined by the atomic radius. For an isolated atom, its atomic radius is the distance between the center of the atom (i.e. center of its nucleus) and its outermost shell.

(b). The atomic radius decreases across a period while going left to right due to increase in nuclear charge.

The number of valence electrons increases from 1 to 8 in going from left to right in a period. Thus, the valency increase first from 1 to 4 and then decreases from 4 to 0 while going from left to right along a period in the modern periodic table.

Answer 2

Define Valency

The combining capacity of an atom is known as its valency. The number of bonds that an atom can form as part of a compound is expressed by the valency of the element.

Valence electron

A valence electron is an outer shell electron that is associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed; in a single covalent bond, both atoms in the bond contribute one valence electron in order to form a shared pair.

Define Atomic

(of a substance) consisting of uncombined atoms rather than molecules.

Define atomic mass

The atomic mass is the mass of an atom. Although the SI unit of mass is kilogram, the atomic mass is often expressed in the non-SI unit dalton where 1 dalton is defined as ¹⁄₁₂ of the mass of a single carbon-12 atom, at rest.

Isotype

antibodies are classified into several types called isotypes or classes. The variable (V) regions near the tip of the antibody can differ from molecule to molecule in countless ways, allowing it to specifically target an antigen.

Isotope

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

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