Question

what is calcium?

answer in 50- 100words​

Answer 1

Calcium is a chemical element with the symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its physical and chemical properties are most similar to its heavier homologues strontium and barium࿐. $\huge\underline{\overline{\mid{\bold{\red{ᴍʀ.sʜᴀʀᴍᴀ❤}}\mid}}}$

Answer 2

$\huge\text{Heya}$

Cᴀʟᴄɪᴜᴍ ɪs ᴀ ᴄʜᴇᴍɪᴄᴀʟ ᴇʟᴇᴍᴇɴᴛ ᴡɪᴛʜ ᴛʜᴇ sʏᴍʙᴏʟ Cᴀ ᴀɴᴅ ᴀᴛᴏᴍɪᴄ ɴᴜᴍʙᴇʀ 20. As ᴀɴ ᴀʟᴋᴀʟɪɴᴇ ᴇᴀʀᴛʜ ᴍᴇᴛᴀʟ, ᴄᴀʟᴄɪᴜᴍ ɪs ᴀ ʀᴇᴀᴄᴛɪᴠᴇ ᴍᴇᴛᴀʟ ᴛʜᴀᴛ ғᴏʀᴍs ᴀ ᴅᴀʀᴋ ᴏxɪᴅᴇ-ɴɪᴛʀɪᴅᴇ ʟᴀʏᴇʀ ᴡʜᴇɴ ᴇxᴘᴏsᴇᴅ ᴛᴏ ᴀɪʀ. Iᴛs ᴘʜʏsɪᴄᴀʟ ᴀɴᴅ ᴄʜᴇᴍɪᴄᴀʟ ᴘʀᴏᴘᴇʀᴛɪᴇs ᴀʀᴇ ᴍᴏsᴛ sɪᴍɪʟᴀʀ ᴛᴏ ɪᴛs ʜᴇᴀᴠɪᴇʀ ʜᴏᴍᴏʟᴏɢᴜᴇs sᴛʀᴏɴᴛɪᴜᴍ ᴀɴᴅ ʙᴀʀɪᴜᴍ.

Sʏᴍʙᴏʟ: Cᴀ

Aᴛᴏᴍɪᴄ ᴍᴀss: 40.078 ᴜ

Aᴛᴏᴍɪᴄ ɴᴜᴍʙᴇʀ: 20

Eʟᴇᴄᴛʀᴏɴ ᴄᴏɴғɪɢᴜʀᴀᴛɪᴏɴ: [Aʀ] 4s²

Vᴀɴ ᴅᴇʀ Wᴀᴀʟs ʀᴀᴅɪᴜs: 231 ᴘᴍ

Mᴇʟᴛɪɴɢ ᴘᴏɪɴᴛ: 842 °C

$\Large\text{❥ᴀsʜley࿐}$