Advertisements
Advertisements
प्रश्न
Which of the following are isoelectronic species i.e., those having the same number of electrons?
Na+, K+, Mg2+, Ca2+, S2–, Ar
Advertisements
उत्तर
Isoelectronic species have the same number of electrons.
Number of electrons in sodium (Na) = 11
Number of electrons in (Na+) = 10
A positive charge denotes the loss of an electron.
Similarly,
Number of electrons in K+ = 18
Number of electrons in Mg2+ = 10
Number of electrons in Ca2+ = 18
A negative charge denotes the gain of an electron by a species.
Number of electrons in sulphur (S) = 16
∴ Number of electrons in S2- = 18
Number of electrons in argon (Ar) = 18
Hence, the following are isoelectronic species:
1) Na+ and Mg2+ (10 electrons each)
2) K+, Ca2+, S2– and Ar (18 electrons each)
संबंधित प्रश्न
Explain the Mass number with example.
What are the atomic numbers of elements whose outermost electrons is represented by 2p3.
What are the atomic numbers of elements whose outermost electrons is represented by 3p5?
Write true or false for the following statement
An atom on the whole has a positive charge.
Tick the most appropriate answer.
Which of these have similar chemical properties but different set of physical properties and mass number?
- isobars
- elements
- isotopes
- none of these
The atomic number of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element which cannot form a cation is :
Draw the orbital diagram of `""_20^40"Ca"^(2+)` ion and state the number of three fundamental particles present in it.
What are orbits or shells of an atom?
If an atom ‘A’ has mass number 35 and atomic number 17, state the number of protons, electrons and neutrons it contains.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Oxygen – \[\ce{^16_8O}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Sodium [At. no. = 11, Mass no. = 23]
The atomic number of an element is 9, it has 10 neutrons. Find the element from the periodic table. What will be its mass number?
The particles that make up the atom are called ______ particles.
What is mass number of an atom?
What is a neutron?
Mass No. 27 is for the element ______.
If element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?
What is the relation between mass number & atomic number?
Ca2+ has completely filled outer shell. Justify your answer.
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.
