[xe]6s²4f⁷ don't understand would love

Noble gas configuration of Europium (Eu)

In this case;

The noble gas configuration is [Xe]6s²4f⁷

The noble gas is xenon which has an atomic number of 54

Therefore;

The atomic number of the element in question is 54 + 2 +7 = 63

Hence,

The element in question is Europium (Eu) with an atomic number of 63

Thus;

[Xe]6s²4f⁷ is the noble gas configuration of Europium (Eu)

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.