Atomic Structure basics

Which two particles are the largest?

• Proton

• Neutron

• Electron

Answer explanation

The two largest particles among the given options are the proton and the neutron. Both of these particles are found in the nucleus of an atom and are collectively known as nucleons. Electrons, on the other hand, are much smaller and lighter, orbiting the nucleus in electron shells.

Which particle is so small that it's considered massless?

• proton

• neutron

• electron

Answer explanation

The electron is considered massless because it is significantly smaller and lighter than the other particles, such as protons and neutrons. Although electrons do have a small mass, it is so negligible that they are often treated as massless in many calculations and models.

What are the 3 subatomic particles that make up an atom?

• Proton

• Neutron

• Electron

• Particles

Answer explanation

The three subatomic particles that make up an atom are protons, neutrons, and electrons. Protons carry a positive charge, neutrons carry no charge, and electrons carry a negative charge. These particles are the fundamental building blocks of atoms, which are the smallest units of a chemical element that retains the properties of that element.

The positive particles of an atom are 

• electrons 

• positrons 

• neutrons 

• protons 

Answer explanation

The question asks about the positive particles in an atom. The correct answer is protons. Protons are positively charged particles located in the nucleus of an atom. Electrons are negatively charged, while neutrons have no charge. Positrons are not typically found in atoms, they are anti-particles of electrons.

The central (middle) region of an atom, where neutrons and protons are located:

• Nucleus

• Electron cloud

• Core

• Center

Answer explanation

The central region of an atom, where its neutrons and protons are located, is known as the nucleus. The other options, such as the electron cloud, core, and center, do not accurately describe this specific region of an atom. Therefore, the correct answer to the question is 'Nucleus'.

Particles in an atom that are neutral and have no charge are:

• Negatrons

• Electrons

• Neutrons

• Protons

Answer explanation

The question asks about the particles in an atom that are neutral and have no charge. The correct answer is Neutrons. Neutrons are located in the nucleus of an atom and they do not carry any charge, hence they are neutral. Other options like Electrons and Protons carry negative and positive charges respectively, while Negatrons is not a recognized term in atomic structure.

A particle is located outside the nucleus and is the only one that can move around freely...

• Proton

• Neutron

• Electron

• Quark

Answer explanation

The question asks about a particle that moves around the nucleus. The correct answer is Electron. Electrons are subatomic particles that orbit the nucleus of an atom. They carry a negative charge and are located in the electron cloud, which is an area surrounding the nucleus. Protons and neutrons, on the other hand, are located inside the nucleus. Quarks are fundamental particles that make up protons and neutrons, but they do not orbit the nucleus.

Which two particles are located in the nucleus of an atom?

• Proton

• Neutron

• Electron

Answer explanation

The nucleus of an atom contains two types of particles: protons and neutrons. Protons carry a positive charge, while neutrons are neutral. Electrons, on the other hand, are located in the electron cloud outside the nucleus and carry a negative charge. Therefore, the correct answer to the question is Proton and Neutron.

Most of the mass of an atom is found in the ______.

• nucleus

• proton

• electron cloud

• isotope

Answer explanation

Most of the mass of an atom is found in the nucleus, which contains protons and neutrons. These particles are much heavier than electrons, which are found in the electron cloud surrounding the nucleus. Isotopes are variations of an element with different numbers of neutrons, but their mass is still concentrated in the nucleus. Therefore, the correct choice is the nucleus.

This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. It depicts electrons floating freely in a positive region.

• The "Plum Pudding Model" of the atom

• The "Rutherford Model" of the atom

• Democritus's model of the atom

• The "Quantum Mechanical Model" of the atom

Answer explanation

The Plum Pudding Model of the atom was developed after J.J. Thompson discovered electrons, which are particles smaller than an atom. This model represents electrons as floating freely within a positive region, resembling a plum pudding dessert where the electrons are the plums and the positive region is the pudding. The other options do not match the description given in the question.