Question

Mass of an atom reside in the nucleus of an atom,Why?​

Answer 1

Answer:

ᴛʜᴇ ᴇʟᴇᴄᴛʀᴏɴs ʜᴀᴠᴇ ᴀ ɴᴇɢᴀᴛɪᴠᴇ ᴄʜᴀʀɢᴇ ᴀɴᴅ ᴠᴇʀʏ ʟɪᴛᴛʟᴇ ᴍᴀss. ᴍᴏsᴛ ᴏғ ᴛʜᴇ ᴍᴀss ᴏғ ᴛʜᴇ ᴀᴛᴏᴍ ɪs ᴄᴏɴᴄᴇɴᴛʀᴀᴛᴇᴅ ɪɴ ᴛʜᴇ ɴᴜᴄʟᴇᴜs, ᴡʜɪᴄʜ ʜᴀs ᴀ ᴘᴏsɪᴛɪᴠᴇ ᴄʜᴀʀɢᴇ. ᴛʜᴇ ᴘᴏsɪᴛɪᴠᴇ ᴄʜᴀʀɢᴇ ɪɴ ᴛʜᴇ ɴᴜᴄʟᴇᴜs ɪs ʙᴀʟᴀɴᴄᴇᴅ ʙʏ ᴛʜᴇ ɴᴇɢᴀᴛɪᴠᴇ ᴇʟᴇᴄᴛʀᴏɴs, ᴍᴀᴋɪɴɢ ᴀɴ ᴀᴛᴏᴍ ɴᴇᴜᴛʀᴀʟ.

Explanation:

ᴘʟᴇᴀsᴇ ғᴏʟʟᴏᴡ ᴍᴇ ᴘʟᴇᴀsᴇ

Answer 2

Answer:

Structure of atom - interactive graphic

Picture 1.6 An atom has a nucleus with electrons outside it.

Inside the nucleus

The atom is made from a central nucleus with electrons around the outside. The electrons have a negative charge and very little mass. Most of the mass of the atom is concentrated in the nucleus, which has a positive charge. The positive charge in the nucleus is balanced by the negative electrons, making an atom neutral.

But what's inside the nucleus? And what are the fundamental particles that make up an atom?

proton neutron electron

a proton a neutron

m 1 1 1

1800

q + 1 0 - 1

Table 1. The relative mass(m) and the relative charge (q) of the three main sub–atomic particles.

What's in the nucleus?

There are two types of particle in the nucleus of an atom: the proton and the neutron.

The proton has a positive charge and a large mass (1800 times more than an electron – see table 1). The number of protons in a nucleus is the same for all the atoms of a particular element. It corresponds to the atomic number of that element. For example, if a nucleus contains three protons, then it is part of an atom of lithium (atomic number 3).

The neutron has a similar mass to the proton but has no charge. The neutrons help keep the nucleus together.

lithiumn nucleus interactive graphic

Picture 1.7 Lithium has 3 positve protons in its nucleus.

name symbol protons Z

hydrogen H 1 1

helium He 2 2

lithium Li 3 3

carbon C 6 6

Table 2. Some atoms and their atomic numbers.

What do protons do?

All atoms of a given element have the same number of protons in the nucleus. This number is the atomic number of the element and we give it the symbol Z.

For example, lithium atoms contain 3 protons. Therefore, the atomic number of lithium is 3. Any atom that has 3 protons must be a lithium atom.