Advertisements
Advertisements
प्रश्न
A nucleus of stable phosphorus has 15 protons and 16 neutrons.
- What is its atomic number and mass number?
- The nucleus of radio phosphorous has one neutron more than the stable nucleus. What will be its atomic number and mass number?
- What will be the atomic number and mass number of new nucleus formed by decay of a β-particle by the radio phosphorus in part (b)?
उत्तर
- Atomic number and mass number are as follows:
Atomic number = no. of protons = 15
Mass number = no. of protons + no. of neutrons = 15 + 16 = 31 - Atomic number = 15 and Mass number = 15 + 17 = 32
- Atomic number = 16 and Mass number = 32.
The number of protons increases by one and the number of neutrons decreases by one following the emission of the β-particle. Thus, while the atomic number (Z) rises by one, the mass number (A) remains same.
APPEARS IN
संबंधित प्रश्न
A certain radioactive nucleus emits a particle that leaves its mass unchanged, but increased its atomic number by one. Identify the particle and write its symbol.
A nucleus is \[\ce {^24_11 Na}\] is β-radioactive.
What are the numbers 24 and 11 called?
A nucleus \[\ce {^A_Z X}\] emits 2 α particles and 1 β particles to form a nucleus \[\ce {^222_85 R}\]. Find the atomic nucleus and mass number of X.
Complete the following nuclear change:
\[\ce {^a_x P -> Q + ^0_-1β}\]
Complete the following nuclear change:
\[\ce{^238_92U -> ^234_90Th}\] + ______ + energy
Complete the following nuclear change:
\[\ce {^238_92 P \text ->[α] Q \text ->[β] R \text ->[β] S}\]
Complete the following nuclear change:
\[\ce {^A_Z X \text ->[α] X_1 \text ->[γ] X_2 \text ->[2β] X_3}\]
Complete the following nuclear changes:
\[\ce {X \text ->[β] X_1 \text ->[α] X_2 \text ->[α] ^172_69 X_3}\]
A radioactive nucleus X emits an alpha particle followed by two beta particles to form nucleus Y.
- With respect to the element X, where would you position the element Y in the periodic table?
- What is the general name of the elements X and Y?
- If the atomic number of Y is 80 then what is the atomic number of X?
A radioactive source emits three type of radiations.
From which part of the atom do these radiations come?
