The natural isotopic abundace of `^10B` is 19.60 % and `^11B` is 80.40 %. The exact isotopic masses are 10.13 and 11.009 respectively. Calculate the average atomic mass of boron.

The atomic masses of three elements A, B and C having similar chemical properties are 7, 23 and 39 respectively. a. Calculate the average atomic mass of element B according to Dobereiner's triads. b. Compare the average atomic mass of B with its atomic mass. c. What could the elements A, B and C be?

Define atomic mass. Chlorine has two stable isotopes , Cl-35 and Cl-37 with atomic masses 34.968u and 36.956u respectively . If the average atomic mass is 35.453u , calculate the percentage abundance.

Solve the following examples / numerical problems: Mahendra and virat are sitting at a distance of 1 meter from each other. Their masses are 75 kg and 80 kg respectively. What is the gravitational force between them ? G = 6.67 xx 10^-11 N-m^2/kg^2.

An element has two isotopes of mass numbers 65 and 67 with abundances of 25 % and 75 % respectively. The atomic mass of the elements is

Boron has two stable isotopes, .^(10)B (19%) and .^(11)B (81%). The atomic mass that should appear for boron in the periodic table is ___________.

A uniform bar RS weighs 100 g and is 80 cm long. From the end R, two masses 50 g and 100 g are hung from the bar at a distance of 10 cm and 60 cm respectively. If the bar is to remain horizontal when balanced on a knifeedge, its position is

Choose the correct options A uniform bar RS weighs 100 g and is 80 cm long. From the end R two masses 50 g and 100 g hung from the bar at a distance of 10 cm and 60 cm respectively. If the bar is to remain horizontal when balanced on a knife-edge, its position is____ A. 42 cm from S B. 38 cm from R C. 38 cm from G D. 42 cm from R

Boron has two isotopes with atomic masses 10 and 11. If its average atomic mass is 10.81, the abundance of lighter isotope is________.

The mass of planet Jupiter is 1.9xx10^(27)kg and that of the Sun is 1.9xx10^(30)kg . The mean distance of Jupiter from the Sun is 7.8xx10^(11) m. Calculate te gravitational force which Sun exerts on Jupiter. Assuming that Jupiter moves in circular orbit around the Sun, also calculate the speed of Jupiter G=6.67xx10^(-11)Nm^(2)kg^(-2) .