Chemistry Class 11 - Ch2 flashcards [ Structure of atom ]

What are the sub atomic particles ?

What are the sub atomic particles ?

• Proton

• Neutron

• Electron

Charge of proton is ____

Positive

Charge of Neutron is _____

Zero / Neutral

Charge of Electron is ______

Negative

What is the mass of proton

1.673 × 10^-27

What is the mass of Neutron

1.675 × 10^-27

What is the mass of Electron

9.109 × 10^-31

What is the relative mass of proton, electron and neutron ( proton = 1 )

• Proton = 1

• Neutron = 1

• Electron = 0.00055

What is the relative charge of proton neutron and electron

• Proton = +1

• Neutron = 0

• Electron = -1

Charge of electron =

-1.6 × 10^-19 C

Charge of proton =

+1.6 × 10^-19 C

Charge of neutron =

0C

Representation of atomic number

Z

What do we call atoms that are charged ?

ions

Representation of mass number

A

What is mass number ?

It is the number of protons and neutrons in the nucleus of an atom.

How do we find the number of neutrons from A and Z ?

Z = p

A = p+n

No. Of neutrons = A - Z = n

B

Protium, Deuterium and Triticum are _____ of hydrogen

Isotopes

What are isotopes..?

They are atoms of a given element which have the same atomic number but differ in their mass number.

What are isobars..?

Isobars are the atoms of different element which have the same mass number but different atomic number. They have different number of electrons, protons & neutrons but sum of number of neutrons & protons remains same. Eg: 4C and IN are isobars

What are isotones..?

Isotones may be defined as the atoms of different elements containing same number of neutrons. Eg: A=14=C and A=16=O are isotones

Atoms with the same number of electrons are called _______

Isoelectronic species

What are known as isoelectronic species..?

They are the atoms, molecules or ions which have the same number of electrons

What are the properties of EMW [ELECTRO MAGNETIC WAVES]…?

• Electric and magnetic field oscillate perpendicular to each other.

• Both oscillate perpendicular to the direction of propagation of wave.

• Do not require any medium for propaga-tion.

• Can travel in vacuum.

• Propagate at a constant speed that is with the speed of light.

What is wavelength…?

It may be defined as the distance between two neighbouring crests or troughs of the wave.

1nm = _____ m

10^-9

1pm = _____ m

10^-12

1 angstrom = _______ m

10^-10

What is frequency…?

It is the number of waves which pass through a particular point in one second

1cps = __Hz

1

1kHz = __ Hz

10³

1MHz = __ Hz

10^6

What is the velocity of a wave..?

The distance travelled by a wave in one second is called the velocity of the wave

The velocity of all electro magnetic radiations in space or vaccum is same and is equal to ______

3×10^8 m/s

Velocity = __ * __

Frequency * wavelength