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CSEE (Form 4) The Atom — practice questions

Explore 28 free The Atom questions in CSEE (Form 4) Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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The Atom questions and exercises with answers

Showing questions 1–28 of 28.

What does the atomic number of an element count?Read the answer and worked solution →Two atoms of the same element hold different numbers of neutrons. What are these two atoms?Read the answer and worked solution →What are the electrons in the outermost energy level of an atom called?Read the answer and worked solution →Why do the noble gases hardly react with any other element?Read the answer and worked solution →Match each scientist to their contributionRead the answer and worked solution →Ionic or covalent?Read the answer and worked solution →Complete the driver of bond formationRead the answer and worked solution →Single, double and triple bondsRead the answer and worked solution →True or false: Lewis structuresRead the answer and worked solution →Complete the definition of resonanceRead the answer and worked solution →Tap every bond parameter the chapter namesRead the answer and worked solution →True or false: ionic solidsRead the answer and worked solution →Assertion and reasonRead the answer and worked solution →Two are true, one is notRead the answer and worked solution →Three of these are wrong. Find the one that holds.Read the answer and worked solution →Bonded pair or lone pair?Read the answer and worked solution →Flip and pair: term with meaningRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Order the reasoning: why resonance is neededRead the answer and worked solution →Reading the definitions backRead the answer and worked solution →True or false: what bond parameters affectRead the answer and worked solution →Bond parameters in useRead the answer and worked solution →Which parameter answers this?Read the answer and worked solution →True or false: resonanceRead the answer and worked solution →Order the steps: draw a Lewis structureRead the answer and worked solution →Spot the one that does not belongRead the answer and worked solution →Assertion and reason: structureRead the answer and worked solution →Flip and pair: parameter with what it measuresRead the answer and worked solution →

Worked practice questions

What does the atomic number of an element count?

  1. Its neutrons
  2. Its nucleons
  3. Its protons
  4. Its molecules
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Correct answer: C. Its protons

1. The chemical properties of an element are set by the charge of its nucleus. 2. That charge comes from the protons, so the count of protons is called the atomic number. 3. The atomic number is written as Z and is the number that orders the periodic table. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 4: The atom_

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Two atoms of the same element hold different numbers of neutrons. What are these two atoms?

  1. They are isotopes
  2. They are isomers
  3. They are ions
  4. They are allotropes
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Correct answer: A. They are isotopes

1. The identity of an element is fixed by its number of protons alone. 2. Adding or removing a neutron therefore leaves the element unchanged. 3. Atoms with the same number of protons but a different number of neutrons are isotopes. 4. An ion is different again, since an ion has gained or lost electrons and carries a charge. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 4: The atom_

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What are the electrons in the outermost energy level of an atom called?

  1. Core electrons
  2. Valence electrons
  3. Paired electrons
  4. Bonded electrons
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Correct answer: B. Valence electrons

1. Electrons sit in energy levels, with the lowest energy nearest the nucleus. 2. Electrons in the outermost energy level of an atom are called valence electrons. 3. All the remaining electrons closer in are the core electrons. 4. Valence electrons matter most because they are the ones that meet other atoms and form bonds. _Source: Siyavula Physical Sciences Grade 10 (Everything Science, CC BY 4.0), Chapter 4: The atom_

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More Chemistry topics

Organic ChemistryAlcohols Phenols EthersAldehydes KetonesAlkenesChemical BondingChemical Bonding and Molecular StructureChemical EquilibriumClassification of Elements