Elements from A to F have the distribution of electrons, protons, and neutrons in the following way. From the table, find a pair of ions Atom/Ion Number of electron Number of protons Number of neutrons A 4 3 4 B 10 11 12 C 17 17 18 D 17 17 20 E 18 18 22 F 19 19 21

The element A and B are ions, because number of electrons and protons are different for these elements. A is anion because it contains one extra electron and B is cation because number of electrons are less than that of atomic number.

Elements from A to F have the distribution of electrons, protons, and neutrons in the following way. From the table, find a pair of Isobars Atom/Ion Number of electron Number of protons Number of neutrons A 4 3 4 B 10 11 12 C 17 17 18 D 17 17 20 E 18 18 22 F 19 19 21

E and F are isobars, because these have same mass number (number of protons + number of neutrons) but different atomic number. Both elements have mass number 40 .

Elements from A to F have the distribution of electrons, protons, and neutrons in the following way. From the table, find a pair of Isotopes. Atom/Ion Number of electron Number of protons Number of neutrons A 4 3 4 B 10 11 12 C 17 17 18 D 17 17 20 E 18 18 22 F 19 19 21

Element C and D are isotopes, because both have same atomic number but different mass number. Both elements have atomic number 17 .

Answer the following question. The electronic configuration of an element is 2 K , 8 L , 2 M . Determine the number of protons and neutrons in the element.

According to given electronic configuration we can say that it contains 12 electrons. Hence, atomic number of given element is 12 . The element with atomic number 12 is magnesium. Hence, the number of proton is 12 . The mass number of given element is 24 . therefore, number of neutron is = 24 - 12 = 12 .

For the symbolsHe4andHe5tabulate the two subatomic particles present in the nucleus of each of them Elements Electrons Protons Neutrons He42 2 2 2 He52 2 2 3

EASY

9th ICSE

IMPORTANT

All In One ICSE Chemistry>Chapter 4 - Atomic Structure and Chemical Bonding>EXAM PRACTICE>Q 41

In the atom of an element

X

,

6

electrons are present in the outermost shell. If it acquires noble gas configuration by accepting requisite number of electrons, then what would be the charge on the ion so formed?

EASY

9th ICSE

IMPORTANT

All In One ICSE Chemistry>Chapter 4 - Atomic Structure and Chemical Bonding>EXAM PRACTICE>Q 42

Which of the two would be chemically more reactive : element '

A

' with atomic number

18

or element '

D

' with atomic number

16

and why?

EASY

9th ICSE

IMPORTANT

All In One ICSE Chemistry>Chapter 4 - Atomic Structure and Chemical Bonding>EXAM PRACTICE>Q 43

Elements from $A$ to $F$ have the distribution of electrons, protons, and neutrons in the following way.

From the table, find a pair of ions

Atom/Ion	Number of electron	Number of protons	Number of neutrons
A	$4$	$3$	$4$
B	$10$	$11$	$12$
C	$17$	$17$	$18$
D	$17$	$17$	$20$
E	$18$	$18$	$22$
F	$19$	$19$	$21$

EASY

9th ICSE

IMPORTANT

All In One ICSE Chemistry>Chapter 4 - Atomic Structure and Chemical Bonding>EXAM PRACTICE>Q 43

Elements from $A$ to $F$ have the distribution of electrons, protons, and neutrons in the following way.

From the table, find a pair of Isobars

Atom/Ion	Number of electron	Number of protons	Number of neutrons
A	$4$	$3$	$4$
B	$10$	$11$	$12$
C	$17$	$17$	$18$
D	$17$	$17$	$20$
E	$18$	$18$	$22$
F	$19$	$19$	$21$

EASY

9th ICSE

IMPORTANT

All In One ICSE Chemistry>Chapter 4 - Atomic Structure and Chemical Bonding>EXAM PRACTICE>Q 43

Elements from $A$ to $F$ have the distribution of electrons, protons, and neutrons in the following way.

From the table, find a pair of Isotopes.

Atom/Ion	Number of electron	Number of protons	Number of neutrons
A	$4$	$3$	$4$
B	$10$	$11$	$12$
C	$17$	$17$	$18$
D	$17$	$17$	$20$
E	$18$	$18$	$22$
F	$19$	$19$	$21$

EASY

9th ICSE

IMPORTANT

All In One ICSE Chemistry>Chapter 4 - Atomic Structure and Chemical Bonding>EXAM PRACTICE>Q 44

The electronic configuration of an element is

2 (K)

,

8 (L)

,

2 (M)

. Predict its valency.

EASY

9th ICSE

IMPORTANT

All In One ICSE Chemistry>Chapter 4 - Atomic Structure and Chemical Bonding>EXAM PRACTICE>Q 44

Answer the following question.

The electronic configuration of an element is $2 (K)$ , $8 (L)$ , $2 (M)$ .

Name of the element.

EASY

9th ICSE

IMPORTANT

All In One ICSE Chemistry>Chapter 4 - Atomic Structure and Chemical Bonding>EXAM PRACTICE>Q 44

Answer the following question.

The electronic configuration of an element is $2 (K)$ , $8 (L)$ , $2 (M)$ .

Determine the number of protons and neutrons in the element.

For the symbols ${He}^{4}$ and ${He}^{5}$ tabulate the two subatomic particles, present in the nucleus of each of them.

Elements Electrons Protons Neutrons

${}_{2}{He}^{4}$ 2 2 2

${}_{2}{He}^{5}$ 2 2 3

Important Questions on Atomic Structure and Chemical Bonding

Learn and Prepare for any exam you want !

Elements	Electrons	Protons	Neutrons
${}_{2}{He}^{4}$	2	2	2
${}_{2}{He}^{5}$	2	2	3

For the symbols He4 and He5 tabulate the two subatomic particles, present in the nucleus of each of them. Elements Electrons Protons Neutrons He42 2 2 2 He52 2 2 3

Important Questions on Atomic Structure and Chemical Bonding

Learn and Prepare for any exam you want !

For the symbols ${He}^{4}$ and ${He}^{5}$ tabulate the two subatomic particles, present in the nucleus of each of them.

Elements Electrons Protons Neutrons

${}_{2}{He}^{4}$ 2 2 2

${}_{2}{He}^{5}$ 2 2 3