Q: A sample contains 0.5 moles of sodium (Na). What is the mass of sodium in the sample? (Atomic mass of Na = 22.99 g/mol)

$$0.5 \times 22.99 = 11.495 g$$

Question 1

Which of the following elements is classified as a transition metal and is located in period 4 of the periodic table?

Accepted Answer

Fe

Question 2

What is the correct electron configuration for the element copper (Cu), atomic number 29?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^1$$\ $$3d^{10}$$

Question 3

A patient is diagnosed with anemia due to iron deficiency. Which element from the periodic table is essential for hemoglobin formation in red blood cells?

Accepted Answer

Fe

Question 4

Which of the following elements has the highest electronegativity?

Accepted Answer

F

Question 5

Calculate the number of neutrons in an atom of $$^{35}_{17}Cl ($$chlorine-35).

Accepted Answer

$$35 - 17 = 18$$ neutrons

Question 6

Which element is a noble gas and is found in period 5 of the periodic table?

Accepted Answer

Kr

Question 7

A sample contains 0.5 moles of sodium (Na). What is the mass of sodium in the sample? (Atomic mass of Na = 22.99 g/mol)

Accepted Answer

$$0.5 	imes 22.99 = 11.495 g$$

Question 8

Which of the following ions has the same electron configuration as neon ($$Ne$$)?

Accepted Answer

$$Na^+$$

Question 9

Which element is most likely to form a $$2+$$ ion based on its position in the periodic table?

Accepted Answer

Mg

Question 10

A compound is formed between magnesium and chlorine. What is the correct chemical formula for this compound?

Accepted Answer

$$MgCl_2$$

Question 11

Which of the following elements is a metalloid?

Accepted Answer

Si

Question 12

Which element is in group 1A and period 3 of the periodic table?

Accepted Answer

Na

Question 13

Which of the following statements best explains why atomic radius decreases across a period from left to right?

Accepted Answer

The number of protons increases, pulling electrons closer to the nucleus.

Question 14

Which element would you expect to have chemical properties most similar to potassium (K)?

Accepted Answer

Rb

Question 15

A patient is given a solution containing $$Ca^{2+}$$ ions. Which group in the periodic table does calcium belong to?

Accepted Answer

2A

Question 16

Which of the following elements is most likely to be found in its diatomic form under standard conditions?

Accepted Answer

O

Question 17

Which element has the electron configuration $$[Ar] 4s^2$ 3d$$^{10}$$ 4p^5$?

Accepted Answer

Br

Question 18

A medical imaging procedure uses technetium-99m. What is the atomic number of technetium (Tc)?

Accepted Answer

43

Question 19

Which of the following elements is a lanthanide?

Accepted Answer

Nd

Question 20

Which of the following best describes the trend in ionization energy as you move down a group in the periodic table?

Accepted Answer

Ionization energy decreases because electrons are farther from the nucleus.

Periodic Table of the Elements: Structure and Use in GOB Chemistry

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