Question

2. How many protons, electrons and
neutrons are present in the following
atoms ? Also indicate the atomic number
and mass number
​

Answer 1

Answer:

we know that,

atomic number=number of protons=number of electrons

number of protons =mass number-atomic number

(a)mass of oxygen =16

atomic number=8

therefore ,number of protons=8

number of electrons=8

and number of protons =mass number-atomic number =8

(b)mass of Cu=69

atomic number of Cu=29

number of protons =29

number of electrons =29

and number of neutrons =35

(c) mass number of P=31

atomic number=15

number of protons=15

number of electrons=15

number of protrons=15

number of neutrons=16

(d)mass number of K=38

atomic number=19

number of protons=19

number of electrons=19

number of neutrons=19

(e)mass number of Te=47

atomic number =22

number of protons=22

number of electrons=22

number of protons=22

number of neutrons=25

Answer 2

Answer:

Given - Mass number of atom = 23 Atomic number of atom = 11As, no. of electrons in an atom is equal to an atomic number of the element.So, number of electrons = 11Secondly , number of protons are equal to number of electrons.so, number of protons = 11And number of neutrons = mass number - atomic number = 23−11 = 12so, number of neutrons = 12So , the atom contains 11 protons, 11 electrons, 12 neutrons.