Answer:
There would be three Lithium atoms per one Nitrogen atom.
3:1
Li3N (Lithium Nitride)
Explanation:
Group 15 elements usually have 5 valence electrons, and every atom wants to have a full valence shell of valence electrons. So, nitrogen can get three electrons from each Lithium atom in order to get a full octet.
1) H
2) He
3) Li
4) Be
5) B
6) C
7) N
8) O
9) F
10) Ne
11) Na
12) Mg
13) Al
14) Si
15) P
16) S
17) Cl
18) Ar
19) K
Answer:
Yes, because each element has the same number of protons and electrons.
Explanation:
The answer is; B
Initially, the earth’s atmosphere was mainly filled with carbon dioxide and methane. However, with the evolution of photosynthetic organisms, the composition of the atmosphere changed to be mainly oxygen. This geological time is referred to as the great oxygenation event. The high oxygen levels resulted in oxidation of most the upper lithosphere.
The answer is; B
During this time, the organism on earth began to evolve and live on land. Therefore these geologic events are marked by fossilized of dead primitive organisms such as archaebacteria within the early rocks
Answer:
Oxidation number of each atom in sodium hydrogen carbonate ( NaHCO3) are
Na = +1
H = +1
C = +4
O = -2
Explanation:
Let's pick the first atom
NaHCO3
find oxidation number of Na
Na + 1 +4 + 3(-2) = 0( because there is no charge)
Na + 5 - 6 = 0
Na = 6 -5
Na = +1
Always put the sign
Find the oxidation number of H in NaHCO3
+1 + H + 4 + 3(-2) = 0.
H + 1 + 4 + 3(-2) = 0
H + 5 -6 = 0
H = 6 -5
H = +1
Find the oxidation number of C In NaHCO3
+1 +1 +C + 3(-2) = 0
C + 1+1-6 = 0
C +2 - 6= 0
C = 6 -2
C = +4
Find the oxidation number of O in NaHCO3
+1 + 1 + 4 + 3(O) = 0
6 + 3 (O) = 0
3(O) = -6
Divide through by 3 to get O
3(O) / 3 = -6 / 3
O = -6/3
O = -2
