Advertisements
Advertisements
प्रश्न
What is common salt? Name the elements present in it. Write the formula of common salt. What are the atomic number and the mass number of the elements? Write the ions in the compound.
उत्तर
- Common salt is mostly sodium chloride. The ionic compound with the formula NaCl, representing equal proportions of sodium and chlorine.
- Elements present is common salt: Sodium & Chlorine.
- Formula of common salt: NaCl Atomic number and mass number of NaCl:
Atomic number of Na = 1 Atomic number of Cl = 17 Mass number of Na = 23
Mass number of Cl = 35 - Ions present in the compound :
Sodium ion Na+ and Chloride ion Cl
APPEARS IN
संबंधित प्रश्न
Explain the Mass number with example.
What are the atomic numbers of elements whose outermost electrons is represented by 3p5?
Multiple Choice Questions
If the atomic number of an atom is 17 and mass number is 35 then number of neutron will be
The properties of the elements are a periodic function of their __________.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Argon – \[\ce{^40_18Ar}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Match the statements in List I with the correct answer from List II.
| List I | List II |
| 1. Mass number of an atom is the number of protons and | A: Electron |
| 2. The sub-atomic particle with a negligible mass. | B: Argon |
| 3. An atom having stable electronic configuration. | C: Nitrogen |
| 4. A molecule formed by sharing of electrons [covalency] | D: Sodium |
| 5. A metallic atom having unstable electronic configuration. | E: Neutrons |
From the symbol \[\ce{^4_2He}\] for the element helium, write down the mass number and the atomic number of the element.
Name the 3 sub-atomic particles of an atom.
______ = No. of protons = No. of the electrons.
If element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?
