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 .

Define the term electrovalent bond

EASY

9th ICSE

IMPORTANT

All In One ICSE Chemistry>Chapter 4 - Atomic Structure and Chemical Bonding>EXAM PRACTICE>Q 39

When

α

-particles are bombarded on a gold sheet, only few of them got deflected, whereas mostly go straight and undeflected? Give reason.

EASY

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IMPORTANT

All In One ICSE Chemistry>Chapter 4 - Atomic Structure and Chemical Bonding>EXAM PRACTICE>Q 40

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

EASY

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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

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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

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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.

Define the term electrovalent bond.

Important Questions on Atomic Structure and Chemical Bonding

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