Advertisements
Advertisements
प्रश्न
The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What are its atomic number and mass number?
Advertisements
उत्तर
Atomic number = Number of protons or number of electrons = 4
Mass number = Number of protons + Number of neutrons = 4 + 5 = 9
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
Dalton said that ______ could not be divided.
What is variable valency? Name two elements having variable valency and state their valencies.
TRUE \ FALSE
After the emission of a beta-particle, the atomic number of the atom increases by one.
ÅIn group I of the periodic table, three elements X, Y, and Z have ionic radii 1.33 Å, 0.95 Å and 0.60 Å respectively. Giving a reason, arrange them in the order of increasing atomic number in the group.
Give reason
Actual atomic mass is greater than mass number.
Match the atomic numbers 4,8,10,15 and 19 with each of the following:
An element which does not form ion
State the main postulates of Dalton’s atomic theory.
Define the term of atomic number.
Give short answer:
what is the atomic mass number? mention its formula.
