8.6ABC Review

Which of the following best describes the type of particle found in the cloud around an atom’s nucleus?

• It has a negative charge and much less mass than a neutron.

• It has a negative charge and about the same mass as a neutron.

• It has a positive charge and much less mass than a neutron.

• It has a positive charge and about the same mass as a neutron.

Which statement accurately describes the atoms of a specific element?

• An Indium, In, atom contains 115 protons inside the nucleus and 49 neutrons outside the nucleus

• A scandium, Sc, atom contains 45 electrons outside the nucleus and 21 neutrons inside the nucleus

• An aluminum, Al, atom contains 27 electrons and 27 protons inside the nucleus

• A zinc, Zn, atom contains 30 protons inside the nucleus and 30 electrons outside the nucleus

Tags

NGSS.MS-PS1-1

What is the total number of protons, neutrons, and electrons in a cadmium, Cd, atom that has a mass number of 112?

Hint: Use APEMAN

• 48

• 64

• 160

• 208

Tags

NGSS.MS-PS1-1

What is the difference between the number of electrons in an atom of selenium, Se, and the number of electrons in an atom on aluminum, Al?

• 34

• 13

• 21

• 47

How many valence electrons are in an atom of carbon (C)?

• 2

• 6

• 12

• 4

Which element is LEAST reactive?

• Hydrogen (H)

• Titanium (Ti)

• Boron (B)

• Neon (Ne)

Which element is MOST reactive?

• Hydrogen (H)

• Titanium (Ti)

• Boron (B)

• Neon (Ne)

Group 18 on the periodic table is called the Noble Gases. Neon is a gaseous element that belongs to this group, and it is a chemically unreactive element and very stable. Why are neon atoms so stable and unreactive?

• They have 10 protons.

• They have 8 valence electrons.

• They have 10 neutrons.

• They have 2 electron energy levels.

Which shaded region contains elements that are shiny, malleable solids?

• A

• B

• C

In which shaded region would you expect to find dull, brittle solids?

• A

• B

• C

Tags

NGSS.MS-PS1-4