I’d say A. They are theoretical in the fact that they have not been observed directly, but have been confirmed to exist through experimentation.
There you go , This is my work i have did on that subject area
<span>6s²4f¹⁴5d¹⁰6p²
6 shows that the element is in the 6 period,
6p² shows that the element is in the 14th group. (1 and 2 groups have s -electrons as last ones, 13 group has s²p¹, and 14 group has s²p²)
The element is Pb.
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<span>Molar mass is the mass in grams of one mole of any pure substance.</span>
Answer: 4. A solution in which methyl orange is red
Explanation:
The others solutions are in their basic form while methyl orange is in it’s acidic form when red.
