Atoms and Elements Full

What do atoms make up?

• Only living organisms

• Only non-living things

• Only microscopic substances

• Everything in the universe

Answer explanation

Atoms make up everything in the universe, not just living organisms, non-living things, or microscopic substances.

Why can't atoms be seen with normal microscopes?

• Because they are transparent

• Because they are colorless

• Because they are too small

• Because they are too large

Answer explanation

Atoms cannot be seen with normal microscopes because they are too small for the resolution of these microscopes to detect.

What type of microscope allows atoms to be seen?

• Light microscope

• Electron microscope

• Scanning tunneling microscope (STM)

• Ultraviolet microscope

Answer explanation

The Scanning tunneling microscope (STM) allows atoms to be seen by using a probe to scan the surface at the atomic level.

What are the three basic particles that make up an atom?

• Protons, Neutrons, Electrons

• Protons, Neutrons, Isotopes

• Neutrons, Electrons, Isotopes

• Protons, Isotopes, Quarks

Answer explanation

The three basic particles that make up an atom are Protons, Neutrons, and Electrons.

Where in the atom are the protons and neutrons located?

• In the electron shells

• Outside the nucleus

• In the nucleus

• In the outermost regions

Answer explanation

Protons and neutrons are located in the nucleus of an atom, not in the electron shells or outermost regions.

What is the charge of the electrons in an atom?

• Positively charged

• No charge

• Negatively charged

• Variable charge

Answer explanation

Electrons in an atom are negatively charged particles.

What are the outermost regions of the atom called?

• Proton layers

• Neutron shells

• Electron shells

• Nucleus

Answer explanation

The outermost regions of the atom are called electron shells, where electrons are located.

What is located at the centre of each atom?

• Electrons

• Neutrons only

• Protons and neutrons

• Empty space

Answer explanation

The correct choice is 'Protons and neutrons' because these particles are located at the center of each atom, forming the nucleus.

Compared to protons, neutrons are:

• Slightly lighter

• The same weight

• Slightly heavier

• Much lighter

Answer explanation

Neutrons are slightly heavier than protons, making them the correct choice among the options provided.

Where is almost all of an atom's mass concentrated?

• In its electrons

• In its protons

• In its nucleus

• Evenly distributed throughout the atom

Answer explanation

Almost all of an atom's mass is concentrated in its nucleus, where protons and neutrons are located.