Let's Review: Element Identity & Reactivity

An atom of which element has 37 protons, 48 neutrons and 1 valence electron?

• Neon (Ne)

• Carbon (C)

• Rubidium (Rb)

• Sodium (Na)

Tags

NGSS.HS-PS1-1

When trying to identify an unknown element, a scientist determines what other elements reacts with chemically. Which property of the unknown element determines the other element it reacts with?

• The total number of neutrons in the unknown element

• The total number of particles in the nucleus of the unknown element

• The number of protons in the nucleus of the unknown element

• The number of valence electrons in the unknown element

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

The atoms of a certain element each contain 9 protons and 7 valence electrons. Which statement correctly identifies this element and describes the chemical reactivity?

• The element is oxygen, and is highly reactive.

• The element is fluorine, and is highly reactive.

• The element is oxygen, and is not very reactive.

• The element is fluorine, and is not very reactive.

Which model represents the most reactive atom?

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Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following characteristics is similar for fluorine and iodine?

• Number of protons

• Number of neutrons

• Number of orbitals

• Number of valence electrons

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

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

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

The following two elements:

• Have similar chemical properties and can be found in Group 7 of the periodic table

• Do not have similar chemical properties and are not in the same group

• Have similar chemical properties and can be found on opposite sides of the periodic table

• Have similar chemical properties and can be found in Group 2 of the periodic table

Tags

NGSS.MS-PS1-1