1. Which is NOT an example of compound?
A. Helium (He)
B. Carbon dioxide (CO2)
C. Isopropyl alcohol (C3HO)
D. Water (HO)
2. At present, how many elements are there in the periodic table?
A. Fifty
B. One hundred
c. One hundred eighteen
D. One hundred twenty
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Answer:
1. A. Helium (He)
Helium is an element that has its atomic number, 2.
2. C. One hundred (118)
There are 118 elements discovered and are recognized by the IUPAC (and CAS). In a periodic table, there are 7 periods and 18 families or groups.
I hope this helps!
Answer:
1.C
2.C
Explanation:
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