The atomic mass of aluminum is 27
and its atomic number is 13, the number of neutrons present in aluminum is:
A) 13
B) 14
C) 15
D) 16
Explanation: Aluminium-27 represents the atomic mass of one Aluminium atom is 27.
The atomic mass of any element is represented by A, thus for Aluminium A=27.
The atomic number is represented by Z, Aluminum has an atomic number Z=13
To calculate the number of protons, neutrons, and electrons:
The number of protons: The number of protons in an atom is equal to the atomic number of that element. So, for the Aluminium-27 number of protons is 13.
The number of neutrons: The number of neutrons is always equal to atomic mass minus atomic number i.e A-Z. Therefore, the number of neutrons in Aluminium-27 is 27-13=14.
The number of electrons: The number of electrons in any neutral atom is equal to the number of protons in the same atom, so, in Aluminium-27, the number of electrons is13.
Hence, the number of protons, electrons, and neutrons in Aluminium-27 is 13, 13, and 14 respectively.
The aim of education is to enable each student to attain all round development according to:
A) their parent’s guidance
B) his/her on attributes
C) learn and create a support system
D) the law
Which statement is true about growth and development?
A) Growth refers to changes in the particular aspect whereas development implies the organization as a whole j
B) Growth stops at a certain stage while development continuous till death
C) Growth is structural whereas development is functional
D) All of the above
لفط "عبد
" کا مطلب ہے بندہ۔ تو
"اید" کا معنی کیا ہیں۔
A) دوام
B) آغاز
C) آفرنیش
D) ہلاکت
مزید معلومات : دوام، ہمیشگی : وہ زمانہ جس کی انتہا مستقبل میں نہ ہو، غیر متناہی زمانہ، (عموماً ازل کے مقابل)
گرائمر کی رو سے لفظ "قینچحی" کونسا اسم ہے؟
A) اسم فاعل
B) اسم صفت
C) اسم آلہ
D) اسم مکتبر
