Shells of an Atom

Q.

Which of the following is not a fundamental particle?

1. Proton

2. Electron

3. Neutron

4. Alpha particle

Q. Which of the following elements will have same number of electrons in its outermost shell when compared to the element having atomic number 17.

1. Sodium
2. Lithium
3. Fluorine
4. Neon

Q.

Define nucleons.

Q.

Describe the composition of an atom.

Q. Which of the following elements has a total of three shells, with four electrons in its outermost shell?

1. Carbon
2. Silicon
3. Phosphorus
4. Sulphur

Q.

What is the simplest form of particle?

Q. Which of the following is/are true regarding the structure of an atom?

1. Charge of an atom is always positive
2. Electrons revolve around the nucleus
3. Nucleus is composed of neutrons and protons
4. Neutron has no charge and is present in every atom

Q.

Identify the element(s) having two electrons in the $\text{K}$ shell of its atom.

1. Hydrogen atom

2. Helium dipositive ion

3. Helium atom

4. Aluminium atom

Q.

The valency of an element can be found from the electronic configuration of its atom write the electronic configuration of the following elements and, hence, their valency as well as the formulae of its chlorides and oxides

${}_{19}{}^{}\mathrm{K}$³⁹

Q. What is the diffrence between atoms and protons?

Q.

Can an atom have no protons?

Q. Elements if arranged in increasing order of atomic number showed similarity in properties after regular intervals. Give reason

Q.

An element X lies in the third period and group 17. Find out name of the element.

Q. Phosphorus is an element belonging to :

1. VB group
2. VA group
3. VIB group
4. VIA group

Q. A molecule X₂ dissociates into atoms after absorbing light of 1320 Å. If one quantum of radiation is absorbed by each molecule, then the kinetic energy of X atom is
[Given, bond energy of X₂ is 500 kJ/mol]
[h = 6.6 × 10^–34 Js]
1320 Å का प्रकाश अवशोषित करने के बाद एक अणु X₂ अपने परमाणुओं में वियोजित हो जाता है। यदि प्रत्येक अणु द्वारा विकिरण का एक क्वाण्टम अवशोषित होता है, तो X परमाणु की गतिज ऊर्जा है
[दिया गया है, X₂ की बन्ध ऊर्जा 500 kJ/mol है]
[h = 6.6 × 10^–34 Js]

1. 4.6 × 10^–13 J
2. 4.2 eV
3. 2.3 × 10^–11 J
4. 2.1 eV

Q. Which of the following is not a shell of an atom?

1. E-shell
2. M-shell
3. L-shell
4. K-shell

Q. Electrons revolve around the nucleus in circular orbits called shells.

1. False
2. True

Q. The element with atomic number 16 belongs to which period?

1. 2
2. 3
3. 4
4. 5

Q. Which of the following element has only one shell?

1. Nitrogen
2. Helium
3. Neon
4. Lithium

Q. Choose the correct pairs based on the maximum electrons that can be accomodated in that shell.

1. K - shell
2. L - shell
3. M - shell
4. N - shell
5. 8 electrons
6. 18 electrons
7. 2 electrons
8. 32 electrons

Q. The first shell can accommodate a maximum of two electrons.

1. True
2. False

Q. In the given diagrams, the circular rings around the nucleus represents:

1. 
2. 
3. 
4. 

Q.

Given below are the electronic configurations of some elements:

(a) 2, 8, 3

(b) 2, 8, 18, 5

(c) 2, 8, 7

(d) 2, 8, 18, 8, 1

(e) 2, 8, 2

(f) 2, 5

(g) 2, 8, 18, 8

Answer the following:

(d) which is an alkali metal?