Question 1: Which of the following elements has the highest electronegativity?

Answer: Fluorine

Question 2: True or False: Elements in the same group have similar chemical properties.

Answer: True

Question 3: Explain why atomic radius decreases across a period.

Answer: Atomic radius decreases across a period due to increased nuclear charge pulling electrons closer.

Question 4: Calculate the number of moles in 24 grams of carbon. (Use the formula: n = mass/Molar mass, where the molar mass of carbon is 12 g/mol.)

Answer: 2 moles

Question 5: Order the following elements by increasing atomic number: Oxygen, Neon, Carbon.

Answer: See full answer key

Question 6: Match the following elements to their group in the periodic table:

Answer: See full answer key

Question 7: Fill in the blank: The first ionization energy ________ as you move down a group.

Answer: decreases

Question 8: Which element is more reactive, sodium or magnesium? Explain your answer.

Answer: Sodium is more reactive than magnesium as it loses one electron more easily than magnesium loses two.

Question 9: True or False: Ionization energy decreases as you move across a period.

Answer: False

Question 10: What is the trend in melting points across Period 3 of the periodic table?

Answer: Melting points generally increase across Period 3, peaking at Silicon.

Question 11: Discuss the trends in metallic character across a period and down a group in the periodic table.

Answer: Metallic character decreases across a period as elements become less likely to lose electrons, and increases down a group as elements more readily lose electrons.

Question 12: Which of the following elements would you expect to have the largest atomic radius? A) Sodium B) Magnesium C) Aluminum D) Silicon

Answer: Sodium

Question 13: Why do elements in the same group often have similar chemical properties?

Answer: Elements in the same group have similar chemical properties because they have the same number of valence electrons.

Question 14: Which element in Group 17 is the most reactive? Explain your reasoning.

Answer: Fluorine is the most reactive in Group 17 because it has the highest electronegativity and smallest atomic radius, allowing it to attract electrons more effectively.

Question 15: Identify the trend in atomic radii as you move down Group 1 of the periodic table.

Answer: Atomic radii increase as you move down Group 1 due to the addition of electron shells.