Oct. DBA

Where is the mass of an atom located?

• contained in the neutron

• contained in the nucleus

• found in the electron cloud

• none of the above

Which subatomic particle have a positive charge?

• Protons

• Negative

• Neutral

• Photons

Reactivity is determined by the---

• Protons in the outer shell

• Protons and neutrons in the nucleus

• Protons and neutrons in the nucleus

• Electrons in the outer shell

Where are the noble gases located?

• Group 18

• Group 1

• Group 17

• Group 2

How is the periodic table organized?

• atomic mass

• atomic numbers

• chemical symbols in alphabetical order

• Nucleus Radius

Hydrogen --- how many electrons are in its outermost shell---

• 1 Valence Electrons

• 2 Valence Electrons

• 0 Valence Electrons

• 8 Valence Electrons

This element has 11 protons and 1 valence electron. What is elements name and reactivity?

• Sodium, and it is a metal with high reactivity

• Sodium, and it is metal with low reactivity

• Potassium, and its a metal with high reactivity

• Potassium and its a non metal with high reactivity

How many Gold (Au) atoms are there in 2Au(NO₃)₂

• 1

• 2

• 3

• 6

Electrons --

• weigh less in mass than a proton

• weigh the same as a proton

• weigh the same as a neutron

• have no mass

Fluorine is very reactive because---

• Has many electrons in its nucleus

• Has fewer neutrons in its outer shell

• Can't lose any electrons

• can gain an electron in its outer shell