Question

define atomicity
define molecular mass​

Answer 1

Answer:

Atomicity is defined as the total number of atoms that constitute a molecule. For example, each molecule of oxygen (O2) is composed of two oxygen atoms. ... Monoatomic-composed of 1 atom e.g. He, Ne, Ar (all noble gases are monoatomic) Diatomic-composed of 2 atoms e.g. H2 , N2 , O. Triatomic-composed of 3 atoms

Explanation:

Description

DescriptionThe molecular mass is the mass of a given molecule: it is measured in daltons. Different molecules of the same compound may have different molecular masses because they contain different isotopes of an element.

Answer 2

ᴀᴛᴏᴍɪᴄɪᴛʏ ɪs ᴅᴇғɪɴᴇᴅ ᴀs ᴛʜᴇ ᴛᴏᴛᴀʟ ɴᴜᴍʙᴇʀ ᴏғ ᴀᴛᴏᴍs ᴛʜᴀᴛ ᴄᴏɴsᴛɪᴛᴜᴛᴇ ᴀ ᴍᴏʟᴇᴄᴜʟᴇ. ... ғᴏʀ ᴇxᴀᴍᴘʟᴇ, ᴇᴀᴄʜ ᴍᴏʟᴇᴄᴜʟᴇ ᴏғ ᴏxʏɢᴇɴ (ᴏ2) ɪs ᴄᴏᴍᴘᴏsᴇᴅ ᴏғ ᴛᴡᴏ ᴏxʏɢᴇɴ ᴀᴛᴏᴍs.

ᴛʜᴇ sᴜᴍ ᴏғ ᴛʜᴇ ᴀᴛᴏᴍɪᴄ ᴍᴀssᴇs ᴏғ ᴀʟʟ ᴀᴛᴏᴍs ɪɴ ᴀ ᴍᴏʟᴇᴄᴜʟᴇ, ʙᴀsᴇᴅ ᴏɴ ᴀ sᴄᴀʟᴇ ɪɴ ᴡʜɪᴄʜ ᴛʜᴇ ᴀᴛᴏᴍɪᴄ ᴍᴀssᴇs ᴏғ ʜʏᴅʀᴏɢᴇɴ, ᴄᴀʀʙᴏɴ, ɴɪᴛʀᴏɢᴇɴ, ᴀɴᴅ ᴏxʏɢᴇɴ ᴀʀᴇ 1, 12, 14, ᴀɴᴅ 16, ʀᴇsᴘᴇᴄᴛɪᴠᴇʟʏ. ғᴏʀ ᴇxᴀᴍᴘʟᴇ, ᴛʜᴇ ᴍᴏʟᴇᴄᴜʟᴀʀ ᴍᴀss ᴏғ ᴡᴀᴛᴇʀ, ᴡʜɪᴄʜ ʜᴀs ᴛᴡᴏ ᴀᴛᴏᴍs ᴏғ ʜʏᴅʀᴏɢᴇɴ ᴀɴᴅ ᴏɴᴇ ᴀᴛᴏᴍ ᴏғ ᴏxʏɢᴇɴ, ɪs 18 (ɪ.ᴇ., 2 + 16).

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