Explanation:
The two isotopes of lithium given are similar in the sense that they have the same atomic number which is 3.
Every kind of an atom of an element have the same atomic number. Atomic number is the number of protons in an atom.
The atoms are different in that they have different mass number because the number of protons they contain are different.
So for isotopes;
- They have the same electronic configuration
- They have similar chemical properties
- But their masses differs
- Their abundance in nature also differs.
Answer:
A tundra has a lower average temperatures year-round.
Answer:
It is 27 % guanine.
Explanation:
They also know that cytosine always pairs off with guanine.
If the molecule is 27 % cytosine, it must also be 27 % guanine.
Answer:
sulfur
Explanation:
sulfur has 4p electrons.
phosphorus has 3p electrons.
The question is asking which one has 4
Cobalt is a Transition Element and it has a partially filled d-orbital. As given it has atomic number 27. In neutral state Cobalt has 27 electrons. These electrons are filled in following order,
1s², 2s², 2p⁶, 3s², 3p⁶, 4s², 3d⁷
Or it can also be written as,
[Ar] 4s², 3d⁷
Where; [Ar] is Argon with electronic configuration 1s², 2s², 2p⁶, 3s², 3p⁶.