Which group is arranged correctly in order of increasing energy for electrons in an element? (A) 2p,2s,1s
(B) 3p,4s,3d
(C) 3s,3d,3p
(D) 2s,4p,3d
(E) 3p,4s,4d

E.)3p,4s,4d

Explanation:

In order as: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p… 1s will be filled first, with the maximum of 2 electrons. 2s will be filled next, with the maximum of 2 electrons. 2p will be filled next, with the maximum of 6 electrons.

B) 3p, 4s, 3d

hope this helped

The given information gives us the clue that deuterium and tritium react together. We need to find the balanced nuclear reaction of deuterium and tritium; however, first, let me explain you what deuterium and tritium are.

Deuterium and tritium are two isotopes of hydrogen having atomic mass of 2 and 3 respectively. Deuterium is represented by , whereas tritium is written as .

When deuterium and tritium collide together, they form Helium atom, which is written as , and also release energy (and shoot out one neutron).

Hence, the balanced nuclear reaction will be the following:

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