Atomic Structure and Chemical Bonding CHEMISTRY - Atomic Structure and Chemical Bonding

Define covalent bond Explain with an example.

what do you understand by electrovalent bond? Explain with an example.

The following table shows electronic configuration of elements P, O, R and S. From the list, choose inert gases and give a reason/reasons for your choice:

Element	Electronic configuration
	K L M N
P	2, 8, 2, _
Q	2, _ , _, _,
R	2, 8, 18, 8,
S	2, 8, 8, _

Choose the inert gases from the following list:
H, He, Na, Ne, Au, Ar, K, Kr, Ra, Rn, Xe.

The number of protons and neutrons in species P to T are given in the table below:

Species	P	Q	R	S	T
Protons	6	18	17	9	17
Neutrons	6	22	18	10	18

From the above table, find the species which represent noble gas. Give one reason for your choice.

Amongst the chlorine atom and chlorine molecule, which has more energy and why?

Name an inert gas having
(a) a duplet structure
(b) an octet structure.

(a)What is the other name of a noble gas?
(b) Why are the atoms of noble gases unreactive?
(c) Why are the atoms of elements other than noble gases reactive?

Choose the noble gases from the element shown in the table below:

Element	A	B	C	D
Mass number	4	40	27	20
Number of neutrons	2	22	13	10

Give the names and symbols of three monatomic gases. Why do not these gases atom molecules?

The composition of two atoms P and Q given below:

Atom	Neutrons	Protons	Electrons
P	13	11	11
Q	12	11	11

(a) What is the mass number of P?
(b) What is the mass number of Q?
(c) How are and Q related to each other ?
(d) which clement do these atoms represent?
(e) Are the elements metals or non-metals?

State three ways by which a proton differs from an electron.

Some carbon atoms have mass number 12 and some have mass number 14, These atoms of different mass numbers are called _________

Isotopes of an element have _________ chemical properties, because they have same number of _________ in their nucleus.

Isotopes have different _________ number, because their nuclei contain different number of _________

Element ___________ has two electrons in K-shell, but is a noble gas.

Element ___________ has one electron in K-shell but is a non-metal.