Answer:
c. gold marbles because they have one type of atom
an element is a substance that is entirely made from one type of atom.
Answer:
Gd(g) →
,
→
,
→ 
Explanation:
Ionization energy is the energy required to remove an electron from a gaseous atom or ion.
The first ionization energy is the energy required to remove the valence electron(outermost) from a neutral atom:
Gd(g)→ 
The second ionization energy is the energy required to remove next/second electron from
ion. The second ionization energy is always higher than the first:
(g) → 
The third ionization energy is the energy required to remove third electron from
ion:
(g) →
Answer:
There's no picture, so I can't help witht his, apologies!
Explanation:
Sedimentary rocks have layers because of different depositions of sediments over time.