Advertisements
Advertisements
प्रश्न
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]
Advertisements
उत्तर
Structure of atoms:
Z is Atomic Number and A is the mass number
Carbon \[\ce{^12_6C}\]
Z = 6 = p = e
K L
e = 6 = 2, 4
A = p + n
12 = 6 + n
∴ n = 12 − 6 = 6
APPEARS IN
संबंधित प्रश्न
Which of the following are isoelectronic species i.e., those having the same number of electrons?
Na+, K+, Mg2+, Ca2+, S2–, Ar
Multiple Choice Questions
The sub atomic particle with negative charge is
From the symbol `""_15^31"P"`, state :
(i) mass number of phosphorus,
(ii) atomic number of phosphorus, and
(iii) electron configuration of phosphorus.
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
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 |
Which of the following are true for an element?
- Atomic number = number of protons + number of electrons
- Mass number = number of protons + number of neutrons
- Atomic mass = number of protons = number of neutrons
- Atomic number = number of protons = number of electrons
Give short answer:
what is the atomic mass number? mention its formula.
A ______ number describes a specific aspect of an electron.
Match the following:
| Column A | Column B | ||
| 1. | Mass of proton | a. | +1 |
| 2. | Mass of electron | b. | -1 |
| 3. | Charge of electron | c. | 9.31 x 10-28g |
| 4. | Charge of proton | d. | 1.67 x 10-24g |
What is the relation between mass number & atomic number?
