# What particle surrounds the nucleus?

## What particle surrounds the nucleus?

Electrons
Electrons are particles that surround the nucleus of an atom like a cloud. As with protons and neutrons, electrons are essential to an atom’s structure.

## Which subatomic particle floats around outside the nucleus?

Electrons are outside the nucleus and orbit about it because they are attracted to the positive charge in the nucleus. Most of the mass of an atom is in the nucleus, while the orbiting electrons account for an atom’s size.

What are three types of subatomic particles?

Subatomic particles include electrons, the negatively charged, almost massless particles that nevertheless account for most of the size of the atom, and they include the heavier building blocks of the small but very dense nucleus of the atom, the positively charged protons and the electrically neutral neutrons.

What are the 5 subatomic particles?

Introduction

Particle Electric Charge (C) Atomic Mass (Au)
Protons +1.6022 x 10-19 1.0073
Neutrons 0 1.0078
Electrons -1.6022 x 10-19 0.00054858

### Which is the least massive particle of the three?

electron
Of the three subatomic particles, the electron has the smallest mass. The mass of an electron is 1/1840 of an atomic mass unit (amu).

### Where are the subatomic particles found in an atom?

The Bohr model shows the three basic subatomic particles in a simple manner. Most of an atom’s mass is in the nucleus— a small, dense area at the center of every atom, composed of nucleons. Nucleons include protons and neutrons. All the positive charge of an atom is contained in the nucleus, and originates from the protons.

Where are neutrons found in the nucleus of an atom?

Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. Neutrons and protons, commonly called nucleons, are bound together in the dense inner core of an atom, the nucleus, where they account for 99.9 percent of the atom’s mass.

Which is the smallest part of an atom?

Electrons are the smallest of the three particles that make up atoms. Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.

#### Which is not present in an ordinary hydrogen atom?

Neutron, neutral subatomic particle that is a constituent of every atomic nucleus except ordinary hydrogen. It has no electric charge and a rest mass equal to 1.67493 × 10−27 kg—marginally greater than that of the proton but nearly 1,839 times greater than that of the electron.