Advertisements
Advertisements
प्रश्न
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Calcium – \[\ce{^40_20Ca}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Advertisements
उत्तर
Calcium – \[\ce{^40_20Ca}\]
Atomic number Z = p = e = 20
Mass number A = p + n
40 = 20 + n
∴ n = 40 − 20 = 20
Ca
15 = 2, 8, 8, 2
(K, L, M, N)
APPEARS IN
संबंधित प्रश्न
Complete the following table.
| Atomic number | Mass number | Number of Neutrons | Number of protons | Number of electrons | Name of the Atomic species |
| 9 | - | 10 | - | - | - |
| 16 | 32 | - | - | - | Sulphur |
| - | 24 | - | 12 | - | - |
| - | 2 | - | 1 | - | - |
| - | 1 | 0 | 1 | 0 | - |
Fill in the blanks.
Isotopes are the atoms of ______ element having the ______ atomic number but ______ mass number.
TRUE \ FALSE
After the emission of a beta-particle, the atomic number of the atom increases by one.
WRITE SHORT ANSWER
Define the atomic mass number of an atom.
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?
The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What are its atomic number and mass number?
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element which can form trivalent ion
If an atom ‘A’ has atomic number 19 and mass number 39, state –
- Its electronic configuration.
- The number of valence electrons it possesses.
Give short answer:
what is the atomic mass number? mention its formula.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.
