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Chemistry 9 icse > Atomic structure and chemical bonding > Flashcards

Atomic structure and chemical bonding Flashcards

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1
Q

Protons and neutrons collectively known as

A

NUCLEONS

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2
Q

Name three subatomic particles

A

Protons, Neutrons and Electrons

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3
Q

Positively charged subatomic particle

A

Proton

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4
Q

Negatively charged subatomic particle

A

Electron

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5
Q

Neutral subatomic particle

A

Neutron

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6
Q

Mass of Proton (also mass of neutron)

A

1 amu

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7
Q

Atom is electrically neutral. Give reason

A

Protons are equal in number and opposite in charge(+1) with electrons(-1) and neutrons have no charge

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8
Q

Define atomic number

A

The number of protons present in the nucleus of an atom

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9
Q

The atomic number of X^-2 ion where total number of

electrons=18 is

A

16

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10
Q

Define Mass number

A

The sum of number of protons and neutrons in an atom

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11
Q

The shell closest to the nucleus

A

K shell

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12
Q

Which electron has minimum energy? The one preseng in L shell or the one present in N shell?

A

The electron present in L shell

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13
Q

While revolving in a shell an electron possesses a certain amount of energy. Hence shells are also called

A

Energy levels

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14
Q

Define electron configuration

A

distribution of elctrons in different shells

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15
Q

The two scientists who gave scheme to distribute electrons in different orbits

A

Bohr and Bury

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16
Q

Maximum number of eletrons which can be present in any shell is given by

A

2n^2

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17
Q

The outermost shell can not have more than __ electrons

A

8

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18
Q

The penultimate shell cannot have more than ___ electrons

A

18

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19
Q

Electron configuration of Calcium ion (at no. 20)

A

2,8,8

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20
Q

Define isotopes

A

Atoms of the same element having same atomic number but different mass number

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21
Q

Noble gases do not gain, lose or share elctrons. Why?

A

They have stable elctronic configuration ie their outermost shell is complete

22
Q

Name the 3 isotopes of Hydrogen

A

Protium, Deuterium, Tritium

23
Q

Chlorine has 2 isotopes, Cl-35 and Cl-37. But its average atomic mass is 35.5 and not 36. Why?

A

Because the Cl-35:Cl-37 existence ratio is 3:1. 1 atom of Cl-37 mass is 37 and 3 atoms of Cl-35 mass is 105. Hence avg mass is 142/2=35.5

24
Q

What is DUPLET arrangement of elctrons?

A

2 electrons in outermost shell ie K shell

25
Q

What is OCTET arrangement of electrons

A

8 electrons in the outerost shell of an atom

26
Q

Which type of chemical bond is formed by transfer of electrons from one atom to another?

A

Ionic bond / Electrovalent bond

27
Q

Which type of chemical bond is formed by mutual sharing of electrons between 2 atoms?

A

Covalent bond

28
Q

Chemical properties of iostopes of same element are similar. Why?

A

Chemical properties are dependent on the electronic configuration of an atom. Isotopes have same atomic number, same number of electrons and hence same electron configuration

29
Q

Physical properties of isotopes of the same element are different. Why?

A

Physical properties are dependent on the atomic mass. Isotopes have different mass number, different number of neutrons and hence different atomic masses

30
Q

The driving force for the atoms of elements otherthan Noble gases to combine chemically with other elements is

A

To attain stable electronic configuration of the nearest Noble gas

31
Q

Calcium will attain stable electronic configuration by ____ ____ ____ electrons

A

loss of two

32
Q

Chlorine will attain stable electronic configuration by ____ ____ ____ electrons

A

gain of one

33
Q

Name the type of bond present in following compound.

CaO

A

Ionic / Electrovalent bond

34
Q

Name the type of bond present in following compound.

HCl

A

Covalent bond

35
Q

Name the type of bond present in following molecule.

Hydrogen

A

Covalent bond

36
Q

Name the ions responsible for the formation of Magnesium chloride, also mention total number of ions required.

A

Mg^+2 and 2 Cl^-1

37
Q

What is a lone pair of electrons

A

A pair of valence electrons that are not shared with another atom in a covalent bond and is sometimes called an unshared pair or non-bonding pair.

38
Q

The eletron configuration of Nitrogen is 2,5. How many electrons in the outermost shell of a nitrogen atom are not involved in the formation of Nitrogen molecule.

A

1 pair

38
Q

The eletron configuration of Nitrogen is 2,5. How many electrons in the outermost shell of a nitrogen atom are not involved in the formation of Nitrogen molecule.

A

1 pair

39
Q

A molecule containing double covalent bond is

A

O2

40
Q

What is the number of covalent bonds present in each of the following molecules.
1) NaCl 2) CaO 3) MgCl2

A

None

41
Q

A molecule which is having single covalent bond(s) in given list.
Hydrogen, Nitrogen, Ammonia, Oxygen, water, methane, carbon tetrachloride

A

Hydrogen, Ammonia, water, methane, carbon tetrachloride

42
Q

How many pairs of electrons are shared between H and Cl atom in the formation of HCl molecule

A

1 pair of electrons

43
Q

The number of lone pair of electrons present in following molecules.
1) H2 2) O2 3) H2O 4) NH3 5) N2 6) CH4 7) CCl4 8) Cl2

A

1) 0 2) 4(2 on each O) 3) 2 4) 1 5) 2(each on 1 N) 6) 0
7) 12 (3 on each Cl) 8) 6 ( 3 on each)

44
Q

Atomic number of following elements given below:
A=8, B=7, C=17, D=11, E=20

1) Which of the above is divalent metal?

A

E

45
Q

Atomic number of following elements given below:
A=8, B=7, C=17, D=11, E=20

1) Which of the above is non-metal?

A

A, B, C

46
Q

Atomic number of following elements given below:
A=8, B=7, C=17, D=11, E=20

1)The type of bonding between two atoms of A

A

double covalent bond

47
Q

Atomic number of following elements given below:
A=8, B=7, C=17, D=11, E=20

1) The type of bonding between D and C.

A

Ionic bond

48
Q

Atomic number of following elements given below:
A=8, B=7, C=17, D=11, E=20

1) Number of covalent bonds formed in a molecule of B2

A

One triple covalent bond

49
Q

A covalent molecule, having two lone pair of electrons

A

water

50
Q

A covalent molecule, having triple covalent bond

A

Nitrogen molecule

51
Q

A covalent hydrocarbon molecule, having four single covalent bonds

A

methane

Chemistry 9 icse (7 decks)

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