8.5b

Compare the data shown in the table. What reasonable conclusion can be made from the information given?

• Element 1 has the same atomic mass as Element 4

• Element 3 has a very similar chemical properties as Element 4

• Element 1 has very similar chemical properties as Element 3

• None of the above

Tags

NGSS.MS-PS1-1

What information from the table could help the student identify the element?

• Protons

• Neutrons

• Atomic mass

• Valence electrons

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NGSS.MS-PS1-1

The atomic number of an element is equal to its number of protons. Therefore, a logical conclusion is that the number of protons determines an element's

• Mass and atomic weight

• Number of stable isotopes

• Identity

• State of matter

Based on the model, which statement accurately describes the reactivity of sodium?

• Sodium is slightly reactive because it has one more neutron than protons

• Sodium is highly reactive because it has a filled outer shell of valence electrons

• Sodium is slightly reactive because it has an equal number of protons and electrons

• Sodium is highly reactive because it has only one valence electron

Tags

NGSS.MS-PS1-1

Where are valence electrons located on the model?

• Near the nucleus

• In the middle of the atom

• At the innermost level

• At the outermost level

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NGSS.MS-PS1-1

Based on the information, what is the identity of this atom?

• Fluorine (F)

• Cobalt (Co)

• Germanium (Ge)

• Nickel (Ni)

Tags

NGSS.MS-PS1-1

Which student's claim about valence electrons in a sulfur atom is correct?

• Student 1

• Student 2

• Both Student 1 and Student 2

• Neither Student 1 nor Student 2

Tags

NGSS.MS-PS1-1

Which statement best explains why protons are used to identify an element?

• Protons are the most easily identified subatomic particles

• Positive charges are more easily detected during an investigation than negative and neutral charges

• The number of protons is unique to each element and remains constant

• Protons alone cannot be used to identify an element. The number of electrons and neutrons must also be known.

A group of students examines a Bohr model of an atom with 8 valence electrons. What conclusion can the students make about the chemical reactivity of the element?

• The element is extremely reactive because the outer energy level is full

• The element is nonreactive because the outer energy level is full

• The element is somewhat reactive because the outer energy level is full

• Additional information is necessary to determine reactivity

Which value is most likely the number of protons for saturntonium?

• 388

• 219

• 169

• 171

Tags

NGSS.MS-PS1-1