Answer:
All i know is The Adoption Of The Bill Of Rights was in 1791
Explanation:
Answer:
the modals of arrangement for first periodic table was. increasing atomic mass and grouping together of elements having similar properties
True because it has to be an capital letter because it’s scientific
Answer: the mass number is 51.9961 u.
Explanation: Basically your looking for the mass number of a ATOM of chromium now if you where looking for chromium and not the atom it's self it would be a different number which is 52-54
Answer:
Al
Explanation:
Protons = mass number - neutrons 56-30 =26 closest is Al 27
Also in group 13 which loses 3 electrons to be +3