What is the relative mass of an electron? a) 1/1840 the mass of a neutron + proton b) 1/1840 the mass of an alpha particle c) 1/1840 the mass of a c-12 atom d) 1/1840 the mass of a hydrogen atom

1/1840 the mass of a C-12 atom

Choice C is correct

Explanation:

The relative mass of an electron is 1/1840 the mass of a C-12 atom . Atomic mass units are expressed relatively to the atomic mass unit of an unbound neutral carbon-12 atom.

d) 1/1840 of hydrogen atom mass is the relative electron mass.

The hydrogen gas is the lightest element and its atomic mass is , same as the mass of proton because it has no neutron and contains one proton and one electron in its atom. But it loses an electron to gain stable electronic configuration leaving only a proton in its atomic structure.

We know, Mass of an electron =

Relative mass of electron = the mass of proton

Relative mass of electron = the mass of hydrogen atom.

sorry i was late, but i don't know what assignment your talking about, i'm in flvs as well, im in earth space science. but u are behind pace bc every class should be in the 3's or 4'

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.