Yes and no he said that all atoms of a given element are identical in mass and properties.
Answer:
Flerovium has 4 valence electrons in its outer shell. So, you did it right. All the dots are in the right place. Just fill in the dots and you should be good.
Hope that helps.
Answer:
= 100u. Hence 10 g = 0.1 mole. Hope it's helpful to u