12D + 13T → 24He + 01n + energy
The reaction above illustrates?
alpha decay
artificial transmutation
nuclear fussion
nuclear fission
Correct answer is C
No explanation has been provided for this answer.
Elements in the same period in the periodic table have the same?
number of shells
atomic number
chemical properties
physical properties
Correct answer is A
Elements within the same group have the same number of electrons in their valence (outermost) shells, and they have similar electron configurations. They exhibit similar chemical properties.
But elements in the same period can determined by the same number of shells.
The maximum number of electrons in the L shell of an atom is?
2
8
18
32
Correct answer is B
The maximum number of electrons present in a particular shell is calculated by the formula 2n2, where “n” represents the shell number. For instance, K shell is the first shell and it can hold up to 2(1)2 = 2 electrons. Similarly, L shell is the second shell and it can hold up to 2(2)2 = 8 electrons.
The stability of the noble gases is due to the fact that they?
have no electron in their outermost shells
have duplet or octet electron configurations
belong to group zero of the periodic table
are volatile in nature
Correct answer is B
Noble / Rare gases belong to group 0 because they have no bonding electrons in their outermost shell to satisfy the octet rule for stability.
How many unpaired electron(s) are there in the nitrogen sub-levels?
3
2
1
none
Correct answer is A
Nitrogen has 7 electrons in all.
Its electronic configuration is = 1s22s22p3
So, it has three unpaired electrons in its p-orbitals.
Note that the p orbital can accommodate a maximum of 6 electrons