Advertisements
Advertisements
प्रश्न
An element ‘A’ has mass number 23 and atomic number 11. State the –
- no. of neutrons in its shell,
- electronic configuration of the element ‘A’.
Advertisements
उत्तर
Mass number A = n + p (atomic number)
A = n + Z
23 = n + 11
∴ n = 23 – 11 = 12
(1) Number of neutrons = 12
(2) e = p = 11
∴ Number of electrons e = 11
∴ Electron configuration of A = 2, 8, 1
APPEARS IN
संबंधित प्रश्न
If number of electrons in an atom is 8 and number of protons is also 8, then
- What is the atomic number of the atom? and
- What is the charge on the atom?
Multiple Choice Questions
If the atomic number of an atom is 17 and mass number is 35 then number of neutron will be
The mass number of an element is 18. It contains 7 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
Do isotopes have the same atomic number or the same mass number?
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Lithium [At. no. = 3, Mass no. = 7]
Differentiate mass number from atomic number.
The atomic number and the mass number of an element is 26 and 56 respectively. Calculate the number of electrons, protons and neutrons in its atom. Draw the structure.
Give short answer:
what is the atomic mass number? mention its formula.
‘A’ is denoted by ______.
State the term for the following:
The amount of substance which contains the same number of units as the number of atoms in carbon-12.
