Unit 1 Test Review: Chemistry

The positive particles of an atom are 

• electrons 
• positrons 
• neutrons 
• protons 

the central region of an atom where its neutrons and protons are is its 

• nucleus 
• electron cloud
• core 
• center 

 An atom is neutral if...    

• The number of protons = electrons
• The number of neutrons = protons
• The number of protons∠ electrons
•  Electrons+Neutrons = 0

The smallest common particle in the atom...   

• electron
• proton
• nucleus 
• neutron

The smallest common particle in the atom...   

• electron
• proton
• nucleus 
• neutron

Which subatomic particle has a negative charge?

• proton

• neutron

• electron

• cybertron

Tags

NGSS.MS-PS1-1

Which subatomic particles is counted to determine the type of element the atom represents?

• proton

• neutron

• electron

• boron

Tags

NGSS.MS-PS1-1

Isotopes are atoms of the same element with a different number of:

• Protons

• Electrons

• Valence electrons

• Nucleus

• Neutrons

Answer explanation

If you change the number of protons, you change of elements. Elements in the periodic table are neutral, therefore the number of proton is always equal to the number of electrons.

The group of the element in the periodic table gives us the ​ (a)   .

The period of the element in the periodic table gives us the ​ (b)  

• number of valence electrons
• number of energy levels
• number of protons
• number of electrons
• number of isotopes

The family colored in the picture is:

• Alkali metals

• Alkaline Earth Metals

• Transition metals

• Noble gases

• Halogens