Fue Eu
312-22
(243)
Am
95
Ameroun Curium
96
151.96 / 157.25 158.93
Gd
200.59
Hg
11241
Gr114.82
31
Berli
Tb
65
오크의
ndum
69.72
Galium
Ga
3.
Which of the following could represent an element in an excited state?
a.
Is? 2s 2p?
b.
1s 2s 2p?
C. 1s 2s 2p5
d. 1s 2s 2p 3s1

b is the correct

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

→

there are two significant figures.