Atomic Structure and Bonding

Sandy was studying a model of a group of atoms. Which of the following statements is TRUE for the atoms shown?

• The mass number of the atoms is different because the number of neutrons is different.

• The mass number of the atoms is the same because the number of protons is the same.

• The atomic number of the atoms is different because the number of neutrons is different.

• The atomic number of the atoms is same because the number of electrons is the same.

Tags

NGSS.MS-PS1-1

Which of the following statements accurately represents the three atoms shown in the image given?

• The three atoms pictured represent different elements.

• The three atoms pictured represent ions of the same element.

• The three atoms pictured represent isotopes of the same element.

• The three atoms pictured represent a neutral atom, an isotope,

  and an ion of the same element.

Tags

NGSS.MS-PS1-1

Iodine, I (atomic number 53), is an essential element for human life. The model illustrates an iodine-127 atom, with 53 protons, 74 neutrons, and 53 electrons.

Which of the following would be the outcome of this essential element if one proton is added to this iodine nucleus?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

In Deanna’s community, calcium fluoride occurs naturally in its drinking water. She drew several models of this compound using these spheres:

Which of Deanna’s models correctly represents a stable calcium fluoride compound?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-1

Electrons have a charge of:

• -1

• -2

• +1

• +2

Tags

NGSS.MS-PS2-3

Protons have a charge of:

• -1

• +1

• -2

• +2

Most atoms have no net charge because they have....

• an equal number of charged and non-charged particles

• neutrons in their nuclei

• an equal number of electrons and protons

• an equal number of neutrons and protons

How many valence electrons does hydrogen have?

• 1

• 2

• 3

• 4

An electron has what kind of charge?

• no charge

• positive 

• negative

• it depends

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which of the following represents a correctly written binary ionic compound for the atoms shown?

• Mg₂P₃

• Mg₃P₂

• P₂Mg₃

• P₃Mg₂

Tags

NGSS.MS-PS1-1