An atom has 3 electrons and 3 neutrons. _3_1) What is the number of protons in t
ID: 3508219 • Letter: A
Question
An atom has 3 electrons and 3 neutrons.
_3_1) What is the number of protons in this atom?
_3_2) What is the atoms atomic number?
_6_3) What is the mass number?
_2_4) How many electrons in the first shell?
_1_5) How many electrons in the second shell?
An atom has 6 neutrons and 6 protons.
_12_6) What is the atomic number?
___7) What is the mass number?
___8) How many electrons does it have?
___9) How many electrons in the 3rd shell?
An atom has a mass number of 24 and 11 protons.
___10) How many neutrons does it have?
___11) How many electrons does it have?
___12) How many electrons in its second shell?
___13) What is its atomic number?
An atom has atomic mass of 32 and 15 electrons.
___14) How many neutrons does it have?
___15) What is its atomic number?
An atom has 18 neutrons and an atomic number of 15.
___16) What is its mass number?
___17) What is the number of electrons?
___18) Is this an ion or an isotope?
An atom has 15 protons and 17 electrons.
___19) How many electrons in the 3rd shell?
___20) What do we call this type of atom?
___21) Calculate the charge?
An ion had 12 protons and 11 electrons.
___22) How many electrons in the second shell?
___23) Calculate the charge?
An atom has a mass number of 25 and contains 13 neutrons?
___24) What is its atomic number?
___25) How many electrons its 3rd shell?
Explanation / Answer
1. Number of protons in this atom = 3 { Because in an atom the number of protons = no. of electrons.}
2.Atom's atomic number = 3 [ Because Atomic number = No.of protons or No. of electrons ]
3.The Mass number is 6 [ Mass number =No.of protons(3) +No. of neutrons (3) = 6 ]
4.Electrons in the 1st shell is calculated by 2n2 =2 X 12 =2
5.Electrons in the 2nd shell is = Total no .of electrons(3)- Electrons in 1st shell (2) =1
6.The atomic number = 6 [ Because the atomic number is equal to the no.of protons ]
7.The Mass number = 12 [ Because the mass number = No.of protons (6) + No. of neutrons (6) =12 ]
8.The electrons it has = 6 [ Because in an atom ,the no.of protons(6) is equal to no.of electrons ]
9.Electrons in 3rd shell = 0 [ Because total electrons are 6 which can be distributed in the 1st and 2nd shells as 2 and 4.]
10.Neutrons it has = Mass number (24) - No. of protons (11) = 13
11.Electrons it has = No.of protons = 11 [ In an atom No.of protons = No.of electrons ]
12.Electrons in its 2nd shell = 2n2 = 2 X 22= 8
13.Atomic number = No.of protons or No.of electrons = 11
14.Neutrons it has = 17 [ Because No.of neutrons= Atomic mass- No.of protons .In an atom no.of protons equals the no.of electrons]
15.Its Atomic number = No.of protons or No.of electrons= 15
16.Its Mass number = No.of protons + No. of neutrons .
Here Atomic number is 15 = No.of protons`
so ,the Mass number = 15 + 18 = 33.
17.The no. of electrons = 15 [ Because the no.of electrons= no.of protons ]
18.It is an isotope [ 15 P33 ] Because here phosphorus differs in mass number (33 )but has the same atomic number (15 ).
19.Electrons in 3rd shell = 7 [ As there are only 17 electrons , they can be distributed in 1st, 2nd and 3rd shells as 2 ,8 , and 7 .]
20. This type of atom is called isotope.and it is phosphorus 15 P 32.
21. The charge is = No. of protons ( +15) + No.of electrons ( -17 ) = -2.
22.Electrons in 2nd shell = 2 X 4 = 8 [ Because 11 electrons can be distributed as 2, 8 , 1 ].
23.The charge = No.of protons ( +12) + No.of electrons (-11) = +1.
24.Its Atomic number = 12 [ Because atomic number = No.of protons. Here Mass number = 25 which is the sum of numbers of protons and neutrons.No.of neutrons=13.so, no. of protons = 25-13=12.]
25. Electrons in 3rd shell = 2 [ Because 12 electrons can be distributed as 2, 8, 2 ]