How many neutrons and electrons are present in the nuclei of C 13 6 , O 16 8 , Mg 24 12 , Fe 56 26 , Sr 88 38 .

C 13 6 , O 16 8 , Mg 24 12 , Fe 56 26 , Sr 88 38 . Number of electrons is equal to the atomic number. Number of neutrons = Mass number - Atomic number. C 13 6 : Number of neutrons = 13 - 6 = 7 , number of electrons = 6 . O 16 8 : Number of neutrons = 16 - 8 = 8 , number of electrons = 8 . Mg 24 12 : Number of neutrons = 24 - 12 = 12 , number of electrons = 12 . Fe 56 26 : Number of neutrons = 56 - 26 = 30 , number of electrons = 26 . Sr 88 38 : Number of neutrons = 88 - 38 = 50 , number of electrons = 38 .

The static electric charge on the oil drop is - 3 . 2044 × 10 - 9 C . How many electrons are present on it?

The charge on an oil drop is - 3 . 2044 × 10 - 9 C . The charge on the electron calculated by the millikan's oil drop method is - 1 . 602 × 10 - 19 C . Hence, the number of electrons = - 3 . 2044 × 10 - 9 - 1 . 602 × 10 - 19 = 2 × 10 10 electrons are present on the oil drop.

A line in lyman series of hydrogen atom has a wavelength of 1 . 03 × 10 - 7 m . What is the initial energy level of the electron?

A line in lyman series of hydrogen atom has a wavelength, λ = 1 . 03 × 10 - 7 m . Lyman series, n 1 = 1 , n 2 = ? We know, 1 λ = R H 1 n 1 2 - 1 n 2 2 Rydberg's constant, R H = 1 . 09678 × 10 7 m - 1 . Substitute the values in the above formula, 1 1 . 03 × 10 - 7 = 1 . 09678 × 10 7 1 1 2 - 1 n 2 2 ⇒ n 2 = 3 . So, the electron belongs to third energy level ( M = 3 ) originally.

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Intermediate First Year Chemistry>Chapter 14 - Model Question Paper>CHEMISTRY 1 Year Text Questions - Corrections - Additions

Telangana Board Solutions for Chapter: Model Question Paper, Exercise 1: MODEL QUESTION PAPER (EFFECTIVE FROM IPE MARCH 2013)

Author:Telangana Board

Telangana Board Chemistry Solutions for Exercise - Telangana Board Solutions for Chapter: Model Question Paper, Exercise 1: MODEL QUESTION PAPER (EFFECTIVE FROM IPE MARCH 2013)

Attempt the practice questions on Chapter 14: Model Question Paper, Exercise 1: MODEL QUESTION PAPER (EFFECTIVE FROM IPE MARCH 2013) with hints and solutions to strengthen your understanding. Intermediate First Year Chemistry solutions are prepared by Experienced Embibe Experts.