Question

ᴡʜᴀᴛ ɪꜱ ʀᴇᴀᴄᴛɪᴠɪᴛy.ꜱᴇʀɪᴇꜱ ᴏꜰ ᴍᴇᴛᴀʟꜱ ꜱʜᴏᴡ ᴛʜᴇ ᴩᴏꜱɪᴛɪᴏɴ ᴏꜰ ᴠᴀʀɪᴏᴜꜱ ᴍᴇᴛᴀʟ ɪɴ ꜱᴜᴄʜ ꜱᴇʀɪᴇꜱ.​​

Answer 1

Answer:

the reactivity series of metal is an arrangement of metal in vertical column in order of decreasing reactivity

Answer 2

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Radioactive series, any of four independent sets of unstable heavy atomic nuclei that decay through a sequence of alpha and beta decays until a stable nucleus is achieved. ... By 1935 these three radioactive series had been fully delineated.