Question

why does beryillium have same no. of electrons in both the shells?​

Answer 1

ᴅᴜᴇ ᴛᴏ sᴄʀᴇᴇɴɪɴɢ ᴄᴀᴜsᴇᴅ ʙʏ ᴇʟᴇᴄᴛʀᴏɴs.

ᴛʜᴇ ɴᴇᴛ ᴀᴛᴛʀᴀᴄᴛɪᴏɴ ᴛᴏ ᴛʜᴇ ɴᴜᴄʟᴇᴜs ᴅᴇᴘᴇɴᴅs ᴜᴘᴏɴ ᴛʜᴇ sʜᴇʟʟ ɴᴜᴍʙᴇʀ ᴀs ᴡᴇʟʟ ᴀs ᴛʜᴇ ɴᴜᴍʙᴇʀ ᴏғ ᴇʟᴇᴄᴛʀᴏɴs.

ᴛʜᴇ ᴇғғᴇᴄᴛɪᴠᴇ ɴᴜᴄʟᴇᴀʀ ᴄʜᴀʀɢᴇ ᴏɴ ᴀɴ ᴇʟᴇᴄᴛʀᴏɴ ᴅᴇᴘᴇɴᴅs ᴜᴘᴏɴ ɴᴜᴍʙᴇʀ ᴏғ ᴇʟᴇᴄᴛʀᴏɴs ɪɴ ᴛʜᴇ sʜᴇʟʟ ᴀs ᴡᴇʟʟ ᴀs ᴛʜᴇʏ ᴄᴀᴜsᴇ sᴄʀᴇᴇɴɪɴɢ ᴏғ ᴛʜᴇ ᴛʜᴇ ᴇʟᴇᴄᴛʀᴏɴ.

ᴛʜᴇ ɴᴜᴍʙᴇʀ ᴏғ ᴇʟᴇᴄᴛʀᴏɴs ᴀʀᴇ ᴍᴏʀᴇ ɪɴ ᴛʜᴇ ᴏxʏɢᴇɴ ᴀs ᴄᴏᴍᴘᴀʀᴇᴅ ᴛᴏ ʙᴇʀʏʟʟɪᴜᴍ ᴛʜᴜs ᴛʜᴇ ᴇʟᴇᴄᴛʀᴏɴs ᴏғ ᴏxʏɢᴇɴ ᴇxᴘᴇʀɪᴇɴᴄᴇ ᴍᴏʀᴇ sʜɪᴇʟᴅɪɴɢ ᴀɴᴅ ᴀs ᴄᴏᴍᴘᴀʀᴇᴅ ᴛᴏ ʙᴇʀʏʟʟɪᴜᴍ ᴀɴᴅ ᴛʜᴜs ᴛʜᴇ ɴᴇᴛ ᴀᴛᴛʀᴀᴄᴛɪᴏɴ ᴛᴏ ᴇʟᴇᴄᴛʀᴏɴs ɪɴ ʙᴇʀʏʟʟɪᴜᴍ ɪs ʟᴇss.

ᴛʜᴇ ᴇʟᴇᴄᴛʀᴏɴɪᴄ ᴄᴏɴғɪɢᴜʀᴀᴛɪᴏɴ ᴀʀᴇ:

ᴏxʏɢᴇɴ = 1s²2s²

ʙᴇʀʏʟʟɪᴜᴍ =1s²2s²2p²

ᴛʜᴇ ᴠᴀʟᴇɴᴄᴇ ᴇʟᴇᴄᴛʀᴏɴs ɪɴ ʙᴇʀʏʟʟɪᴜᴍ ᴇxᴘᴇʀɪᴇɴᴄᴇ ʟᴏᴡᴇʀ ɴᴇᴛ ᴀᴛᴛʀᴀᴄᴛɪᴏɴ ᴛᴏ ᴛʜᴇ ɴᴜᴄʟᴇᴜs.

Answer 2

Answer:

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Explanation:

Electrons In The Shells

Take a look at the picture below. Each of those colored balls is an electron. In an atom, the electrons spin around the center, also called the nucleus. The electrons like to be in separate shells/orbitals. Shell number one can only hold 2 electrons, shell two can hold 8, and for the first eighteen elements shell three can hold a maximum of eight electrons. As you learn about elements with more than eighteen electrons you will find that shell three can hold more than eight. Once one shell is full, the next electron that is added has to move to the next shell.

So... for the element of BERYLLIUM, you already know that the atomic number tells you the number of electrons. That means there are 4 electrons in a beryllium atom. Looking at the picture, you can see there are two electrons in shell one and two in shell two.