Ions, Valence, and Bohr Models

What ion is formed by rubidium when it is chemically stable?

• Rb⁺

• Rb⁺²

• Rb^-

• Rb^-2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What ion is formed by oxygen when it is chemically stable?

• O⁺

• O⁺²

• O^-

• O^-2

Copper can form charges of +1, +2, +3, and +4. What is the charge of copper(III)?

• +1

• +2

• +3

• +4

What is the total number of electrons in an N^-3 ion?

• 4

• 7

• 8

• 10

Tags

NGSS.MS-PS1-1

Which of the following ions has more electrons than protons?

• Be²⁺

• K¹⁺

• S^2-

• C⁴⁺

What's a valence electron?

• electrons in the second energy level
• electrons in the outermost energy level
• the atomic number
• electrons in the first level

Tags

NGSS.MS-PS1-1

Which ion is formed when an atom loses 3 electrons?

• 3+

• 3-

• 2+

• 2-

How many valence electrons does a neutral atom of phosphorus have?

• 2

• 3

• 4

• 5

Which element produces a yellow/orange flame in a flame test?

• Lithium chloride

• Potassium iodide

• Barium sulfide

• Sodium chloride

What would be the color of the flame produced by copper sulfate in a flame test?

• red

• pink-lilac

• green

• yellow

Tags

NGSS.HS-PS1-2