Advertisements
Advertisements
प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 2p3.
Advertisements
उत्तर
2p3
Completing the electron configuration of the element as
1s2 2s2 2p3.
∴ Number of electrons present in the atom of the element = 2 + 2 + 3 = 7
∴ Atomic number of the element = 7
APPEARS IN
संबंधित प्रश्न
Explain the Mass number with example.
What are the atomic numbers of elements whose outermost electrons is represented by 3p5?
Dalton said that ______ could not be divided.
Fill in the blanks.
Isotopes are the atoms of ______ element having the ______ atomic number but ______ mass number.
What are the two main features of Rutherford’s atomic model?
What is variable valency? Name two elements having variable valency and state their valencies.
Fill in the blanks- The number of protons in the nucleus of an atom is called its ....................
Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?
Give reason
Actual atomic mass is greater than mass number.
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
Which sub-atomic particles in the 3 isotopes of ‘H’ are the same.
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]
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Carbon [At. no. = 6, Mass no. = 12]
Atomic number : ______ :: Mass number : Number of protons and neutrons.
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.
Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.
A ______ number describes a specific aspect of an electron.
Mass No. 27 is for the element ______.
Match the following:
| Column A | Column B | ||
| 1. | K shell | a. | 8 |
| 2. | L shell | b. | 32 |
| 3. | M shell | c. | 2 |
| 4. | N shell | d. | 18 |
What is the relation between mass number & atomic number?
