The term meniscus refers to
o a) a type of glassware used to measure volume
ob) the curved surface of a liquid being measured
oc) a common error made when using a stopwatch
od) the part of a microscope that magnifies the sample

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom