Exploring Atoms and Molecules in Class 9

What are the basic building blocks of all material?

• Electrons

• Grains of sand

• Atoms

• Molecules

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Which particles are found in the nucleus of an atom?

• Electrons and protons

• Neutrons and electrons

• Protons and neutrons

• Only protons

What charge do protons carry?

• Negative

• No charge

• Positive

• Neutral

Who introduced the concept of electron shells or orbits?

• Rutherford

• Newton

• Einstein

• Bohr

What is the maximum number of electrons that the K shell can hold?

• 18

• 8

• 2

• 32

What are valence electrons?

• Protons in the nucleus

• Electrons in the outermost shell

• Electrons in the innermost shell

• Neutrons in the nucleus

What is a molecule?

• A group of two or more atoms chemically bonded

• A type of electron

• A single atom

• A group of protons and neutrons

Tags

NGSS.MS-PS1-1

What external factors can cause atoms to combine chemically?

• Heat and light

• Pressure and sound

• Magnetism and gravity

• Electricity and magnetism

Tags

NGSS.HS-PS1-5

What type of bond is formed when atoms share electrons?

• Hydrogen bond

• Metallic bond

• Covalent bond

• Ionic bond

What is a hetero atomic molecule?

• A molecule with only one atom

• A molecule with no atoms

• A molecule with atoms of different elements

• A molecule with atoms of the same element

Tags

NGSS.MS-PS1-1