GRADE 9-2NDQTR-Diagnostic Test

What is the attractive force that joins atoms together?

• Valence electrons

• Chemical bond

• Lewis structure

• Octet rule

Which electrons are involved in chemical bonding and chemical reactions?

• Valence electrons

• Chemical bond

• Lewis structure

• Octet rule

What does the Lewis electron dot symbol represent?

• Valence electrons

• Chemical bond

• Lewis structure

• Octet rule

Who proposed the Octet rule?

• Gilbert Lewis

• Valence electrons

• Chemical bond

• Lewis structure

Which atoms follow the duet rule instead of the octet rule?

• Hydrogen and helium

• Valence electrons and chemical bond

• Lewis structure and octet rule

• Gilbert Lewis and Lewis electron dot symbol

What is the simplest form of substance that cannot be broken into simpler substances?

• molecule
• element
• compound
• atom

What is composed of two or more atoms that are chemically bonded?

• element
• compound
• molecule
• ion

What is composed of two or more elements and has a constant composition?

• Compound
• Element
• Mixture
• Solution

What is an electrically charged atom or molecule?

• ion
• proton
• electron
• neutron

What is the positively charged ion called?

• cation
• electron
• neutron
• anion