Question

Q.2 Fill in the blanks
1) In a period, on moving from left to right tonisation
energy
2. periodic law made by taking atomic mass as the basis
called
Q.3 Write answer the following questions (any3)
1. What is diagornal relationships explain giving exam
2. What is mendeleev's periodic law?
3. explain hund's rule with an example.
A. What is Atomic rember explain it.
1.4 Write answer the following gestion.
1. Write differences betwee and orbital (any
2. What do you mean by sotopes Isobar? exp
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nyample​

Answer 1

Answer:

1) In a period, on moving from left to right ionisation energy INCREASES

2) Periodic law made by taking atomic mass as the basis called MENDELEEV'S LAW.

3) A diagonal relationship is said to exist between certain pairs of diagonally adjacent elements in the second and third periods (first 20 elements) of the periodic table.

Examples

lithium (Li) and magnesium (Mg),

beryllium (Be) and aluminium (Al),

boron (B) and silicon (Si).

2) MENDELEEV'S law

Mendeleev's periodic law states that the properties of elements are the periodic functions of their atomic masses.

Elements in each group have similar physical and chemical properties (valency, melting point).

The periods are made with elements written in rows of increasing atomic masses.

3) See attached photo...

4). The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element.

The atomic number uniquely identifies a chemical element.

It is identical to the charge number of the nucleus.

5)Differences between Orbit and Orbitals

(PLEASE USE TABLE TO DIFFERENTIATE)

ORBIT

1)An orbit is the simple planar representation of an electron.

2)It can be simply defined as the path that gets established in a circular motion by revolving the electron around the nucleus

3)The shape of molecules cannot be explained by an orbit as they are non-directional by nature.

4)An orbit that is well-defined goes against the Heisenberg principle.

ORBITAL

1)An orbital refers to the dimensional motion of an electron around the nucleus in a three-dimensional motion.

2)An orbital can simply be defined as the space or the region where the electron is likely to be found the most.

3)The shapes of the molecules can be found out as they are directional by nature.

4) An ideal orbital agrees with the theory of Heisenberg’s Principles.

2 ISOTOPES:

Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.

Examples: carbon-12, carbon-13, and carbon-14 are three isotopes of the element carbon with mass numbers 12, 13, and 14, respectively.

ISOBARS:

Isobars are atomic species that have the same mass number (A), but a different atomic number (Z).

Examples:

Two elements calcium and argon . The number of electrons in these atoms is different, but the mass number of both these elements is 40.