Atomic Structure Test

The particles located within X have

• only neutral charges

• only negative charges

• positive or neutral charges

• positive or negative charges

Which of these best describes the subatomic particle Y in the diagram?

• Particle Y has a positive charge and the same mass as the particles located at X.

• Particle Y has a negative charge and less mass than the particles located at X.

• Particle Y has a negative charge and no mass.

• Particle Y has no charge and no mass.

How many protons are in atom III?

• A. 8

• B. 16

• C. 19

• D. 27

What is the valence charge of atom I?

• -1

• +1

• 0

• -2

How many protons are in atom II?

• 0

• 3

• 11

• 12

Which number is used to identify an atom?

• A. Y is used because it does not vary in atoms of the same element.

• B. X is used because it does not vary in atoms of the same element.

• C. X is used because it represents the number of neutrons in an atom.

• D. Y is used because it represents the number of electrons in an atom.

Which is used to determine if an atom is a specific isotope of another atom?

• Both X and Y, because an isotope is determined by the number of protons and neutrons.

• Neither X nor Y, because an isotope is determined by the number of electrons and protons.

• Y, because it represents the number of protons in an atom and is used to calculate the mass.

• X, because it represents the number of neutrons in an atom and is used to calculate the mass.

Read the passage - 'Reactions with Hydrogen' - and answer the following question(s). Hydrogen gas is found in nature as a diatomic gas with the chemical formula of H₂. This means that, in nature, two hydrogen atoms are bound together to form a stable structure. A single hydrogen atom is made up of only an electron and a proton. When two hydrogen atoms bond together, they share the electrons in their outer shell. This fills the orbital with two electrons, thus forming a stable configuration. The bond is easily broken, and hydrogen will react with many different elements in the main group. This table shows the main group elements and their electron configurations.

• What is the chemical formula of hydrogen gas found in nature?

• What is the structure of a single hydrogen atom?

• How do two hydrogen atoms form a stable configuration?

• With which elements does hydrogen react easily?

What is the chemical reaction between hydrogen and sulfur?

• Hydrogen sulfide formation

• Sulfur dioxide formation

• Water formation

• Sulfur trioxide formation

B. Based on the configuration of the electrons in the outermost shell, explain the charge on both atoms in the product.

• The charge on both atoms is positive due to electron loss.

• The charge on both atoms is negative due to electron gain.

• One atom is positive and the other is negative due to electron transfer.

• Both atoms are neutral as they share electrons equally.