In the modern periodic table, find the element named lead (Pb). How many protons do atoms of lead have? To which class of elements does lead belong?

The double bond between a carbon atom and two oxygen atoms (a molecule of carbon dioxide) has two characteristics. what are they? a.an ionic bond is formed between the oxygen and carbon atoms. b.four valence electrons are shared. c.two valence electrons are shared. d.valence electrons are shared between oxygen atoms.

Where does oogenesis take place ? seminiferous tubules fallopian tubes ovaries uterus

Has magnification ability of hundreds of thousands of times