Advertisements
Advertisements
प्रश्न
Select the correct answer from the answer in the bracket to complete the sentence.
An atom with electronic configuration 2, 7 and mass number 19 will have ________ neutrons.
पर्याय
8
10
12
उत्तर
An atom with electronic configuration 2, 7 and mass number 19 will have 10 neutrons.
APPEARS IN
संबंधित प्रश्न
Define the atomic mass unit.
A 0.24 g sample of compound of oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of oxygen. Calculate the percentage composition of the compound by weight.
An element with mass number 81 contains 31.7% more neutrons as compared to protons. Assign the atomic symbol.
Define gram atomic mass of a substance. How much is the gram atomic mass of oxygen ?
Explain the need for a reference atom for atomic mass. Give some information about two reference atoms.
What is meant by atomic mass number?
Define the following form:
Atomic mass number
Explain the following:
An element has atoms with different mass numbers.
Define the term of mass number.
Write down the mass number of the atom having 20 neutrons and 15 protons.
The average atomic mass of hydrogen is ______ amu.
The gram atomic mass of an element has no unit.
Write the different types of isotopes of oxygen and their percentage abundance.
Calculate the % of oxygen in Al2(SO4)3. (Atomic mass: Al-27, O-16, S -32)
One electron is present in the outermost shell of the atom of an element X. What would be the nature and value of charge on the ion formed if this electron is removed from the outermost shell?
What are the postulates of Bohr’s model of an atom?
Chlorine exists in two isotopic forms, \[\ce{Cl-37}\] and \[\ce{Cl-35}\] but its atomic mass is 35.5. This indicates the ratio of \[\ce{Cl-37}\] and \[\ce{Cl-35}\] is approximately
The ratio of masses of H and O in H2O is ______.
