Based on the kinetic theory, which statement is true?
2 answers:
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Answer :
'n' specifies → (B) The energy and average distance from the nucleus.
'l' specifies → (C) The subshell orbital shape.
'ml' specifies → (A) The orbital orientation.
Explanation :
Principle Quantum Numbers : It describes the size of the orbital. It is represented by n. n = 1,2,3,4....
Azimuthal Quantum Number : It describes the shape of the orbital. It is represented as 'l'. The value of l ranges from 0 to (n-1). For l = 0,1,2,3... the orbitals are s, p, d, f...
Magnetic Quantum Number : It describes the orientation of the orbitals. It is represented as . The value of this quantum number ranges from
. When l = 2, the value of
Spin Quantum number : It describes the direction of electron spin. This is represented as . The value of this is
for upward spin and
for downward spin.
As per question we conclude that,
'n' specifies → The energy and average distance from the nucleus.
'l' specifies → The subshell orbital shape.
'ml' specifies → The orbital orientation.
Answer:
Astatine is a halogen with several isotopes that all have short half-lives.
Which of the following combinations of mass number and neutrons are possible as isotopes of astatine? Choose one or more:
i) A = 211, n = 127
ii) A = 210, n = 125
iii) A = 220, n = 134
iv) A = 207, n = 122
v) A = 209, n = 124
Explanation:
The mass number is the sum of the number of protons and the number of neutrons in an atom.
Atomic number of At(astatine ) =85
That means it has --- 85protons.
Its mass number A=210
Hence, the number of neutrons in At are:
Second option:
ii) A=210 , n=125 is the answer.