24-25 Periodic Table Quiz

How did Dmitri Mendeleev arrange the elements in his periodic table?

• Alphabetically by element name
• By increasing atomic number
• By increasing atomic mass and grouping elements with similar properties
• By the number of neutrons in the nucleus

What is the atomic number of strontium (Sr)?

• 38
• 87.62
• 2
• 5

What is the atomic mass of copper (Cu)?

• 11
• 63.55
• 4
• 30

How many protons does an atom of aluminum have?

• 3, which is equal to its group number
• 3, which is equal to its period number
• 13, which is equal to its atomic number
• 26.98, which is equal to its atomic mass

What do the vertical groups (columns) on the periodic table represent?

• Elements with the same atomic number
• Elements with similar chemical properties and the same number of valence electrons
• Elements arranged in order of increasing atomic mass
• Elements that have the same number of energy levels

Which of the following is a true statement about the horizontal arrangement (periods) on the periodic table?

• Elements in the same period have the same number of valence electrons.
• Elements in the same period have similar chemical properties.
• Elements in the same period have the same number of energy levels
• Elements in the same period are arranged by decreasing atomic number.

Which of the following elements has similar chemical properties to sodium (Na)?

• Neon (Ne) because it is the element right before sodium (Na)
• Calcium (Ca) because it is diagonal to sodium (Na)
• Potassium (K) because it is in the same group as sodium (Na)
• Magnesium (Mg) because it is in the same period is sodium (Na)

How many valence electrons does a halogen have?

• 1
• 5
• 7
• 8

Boron is a brittle element that can conduct electricity better than nonmetals but not as well as metals. What type of element is boron?

• Metal
• Non-Metal
• Metalloid

Oxygen is essential for respiration, exists as a gas at room temperature, and does not conduct electricity. Based on these properties, it would be classified as?

• Metal
• Non-Metal
• Metalloid