atomic structure and periodic table

Which element is found in Group 1, period 3 of the periodic table?

• neon

• nickel

• nitrogen

• sodium

Which subatomic particle has a positive charge?

• atom

• electron

• neutron

• proton

Which element has a relative atomic mass of 108?

• silver

• selenium

• sulfur

• mercury

How many neutrons are there in an atom of aluminum?

• 13

• 14

• 27

• 40

Tags

NGSS.MS-PS1-1

What name is given to elements in Group 0 of the periodic table?

• alkali metals

• halogens

• noble gases

• transition metals

Hydrogen and nitrogen monoxide react to form water and nitrogen. What is the balanced symbol equation for this reaction?

• H + NO → H2O + N

• 2H2 + 2NO → 2H2O + N2

• H2 + NO → H2O + N2

• H2 + 2NO → H2O + 2N

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which scientist conducted experimental work that provided evidence to show the existence of neutrons within the nucleus of an atom?

• Bohr

• Chadwick

• Dalton

• Thomson

What does a mixture contain?

• atoms of the same element with different numbers of neutrons

• only one type of atom

• two or more elements chemically combined together

• two or more substances not chemically combined together

Boron exists naturally as two isotopes, 10B and 11B. The abundance of 10B is 20% and the abundance of 11B is 80%. What is the relative atomic mass of boron to 3 significant figures?

• 10.2

• 10.8

• 11.2

• 11.8

Which statement about the elements in Group 7 is not correct?

• they are all unreactive

• they all have seven electrons in their outer shell

• their melting points increase as you go down the group

• they form diatomic molecules