8th Science - Chapter 1

Who discovered there is a dense, positive nucleus in an atom?

• Dalton

• Rutherford

• Thomson

• Chadwick

The total number of protons and neutrons in an atom

• Atomic mass

• Atomic number

• Mass number

• Isotopes

A metal and nonmetal would take part in which type of bond?

• Polar covalent

• Nonpolar covalent

• Ionic

• Hydrogen

Tags

NGSS.HS-PS1-1

The most reactive nonmetals are the

• Halogens

• Noble gases

• Carbon family

• Nitrogen family

Who first said that atoms are tiny pieces of matter that cannot be divided?

• Thomson

• Dalton

• Rutherford

• Chadwick

Tags

NGSS.HS-PS1-7

Which element has 3 valence electrons?

• Magnesium (Mg)

• Bromine (Br)

• Potassium (K)

• Aluminum (Al)

Which elements would you expect to be brittle, poor conductors, and dull in appearance?

• Metals

• Metalloids

• Nonmetals

• All of these

Which element would form an ion with a (-3) charge?

• Oxygen

• Boron

• Phosphorus

• Neon

A bond in which electrons are equally shared between two atoms is a...

• Ionic bond

• Polar covalent bond

• James bond

• Nonpolar covalent bond

A substance with a pH less than 7 is a(n) ____________

• Base

• Neutral substance

• Acid

• Cannot tell