The number of nucleons is called ………….. of the atom.
A) atomic number
B) atomic mass number
C) atomic mass
D) atomic volume
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A die is thrown once. Find the probability of getting (i) an even number (ii) a number less than 5 (iii) a number greater than 2 (iv) a number between
Correct Answer - `(i) 1/2 (ii) 2/3 (iii) 2/3 (iv) 1/3 (v) 5/6 (vi) 1/6`
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Give reason : The approximate atomic mass in Daltons is numerically equal to the number of nucleons in the atom.
The electrons possess negligible mass. They do not contribute much to the mass of an atom. Therefore, the entire mass of an atom is supposed to be present in the nucleus...
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The number of positive charges (protons) in the atom of an element is called………………
A) Atomic number
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A reaction in which an atom or a group of atoms in a compound is replaced by other atom or group of atoms is called ……………… reaction.
Correct option is C) substitution
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The number of times one atom of given element is heavier than 1/12th part of atomic mass of carbon – 12 is called as ……………..
C) atomic mass
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The nucleons are A) protons and electrons
C) protons and neutrons
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The number of nucleons is the A) atomic number
B) mass number
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The number of electrons present in outer most orbit of an atom is called ……………… electrons.
Correct option is A) valency
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In a senior secondary school,80 students play football or hockey.The number that play football is 5 more than twice the number that play hockey.If 15 students play both games and every student in the school plays at least one game,find (i)the number of students that play football (ii)the number of students that play football but not hockey (iii)the number of students that play hockey but not football.
I thought F or H = 80 is giving by n(F u H) = n(F) + n(H) - n(F n H)
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