Ineed answers !
2. the discovery of what element showed the usefulness of mendeleev’s periodi...
Chemistry, 26.01.2020 01:31 kellysmith45
Ineed answers !
2. the discovery of what element showed the usefulness of mendeleev’s periodic table?
a: gallium
b: aluminum
c: scandium
d: germanium
3. why is not a reason why the mass of an atom is expressed in atomic mass units rather than in grams?
a: atomic mass allows for mass differences in isotopes.
b: atomic mass units make it easier to compare the masses of atoms.
c: the mass in grams is too small to be useful.
d: scientists could not agree on a standard.
4. what class of elements includes all of the elements that are gases at room temperature?
a: metals
b: nonmetals
c: metaloids
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