The cards Question What is the relative charge of an electron? Tap to flip Answer -1 Question Roughly what is the relative mass of an electron? Tap to flip Answer About 0.0005, which is very small compared with a proton or neutron. Question What is the relative charge of a proton? Tap to flip Answer +1 Question What is the relative mass of a neutron? Tap to flip Answer 1 (the same as a proton). Question What electric charge does a neutron have? Tap to flip Answer None: a neutron is neutral. Question Which two subatomic particles make up the nucleus of an atom? Tap to flip Answer Protons and neutrons. Question Why does an atom have no overall electric charge? Tap to flip Answer It has equal numbers of protons and electrons, so their charges cancel out. Question Roughly how many times larger is an atom than its nucleus? Tap to flip Answer About 10,000 times: the atom's radius is about 0.1 nm, the nucleus's about 0.00001 nm. Question In the plum pudding model, how are the electrons arranged? Tap to flip Answer Negative electrons are embedded in a ball of positive charge. Question In Rutherford's scattering experiment, what was fired at what? Tap to flip Answer A stream of positive alpha particles was fired through a thin piece of gold foil. Question Which model of the atom replaced the plum pudding model after the alpha scattering experiment? Tap to flip Answer The nuclear model. Question In the nuclear model, what is most of the atom made of? Tap to flip Answer Empty space, with a small positive centre surrounded by orbiting electrons. Question What decides which element an atom belongs to? Tap to flip Answer Its number of protons: each element has its own unique proton number. Question What is an element? Tap to flip Answer A substance made of only one type of atom. Question What is a compound? Tap to flip Answer A substance made of two or more different elements chemically bonded together. Question Is a hydrogen molecule (two hydrogen atoms joined) a compound? Tap to flip Answer No. Both atoms are the same element, so it is an element; only some molecules are compounds. Question In what order are elements arranged in the modern periodic table? Tap to flip Answer By increasing atomic number (proton number). Question What is a period in the periodic table? Tap to flip Answer A horizontal row. Question What does an element's period tell you about its atoms? Tap to flip Answer The number of electron shells that contain electrons. Question What does an element's group (column) tell you about its atoms? Tap to flip Answer The number of electrons in the outer shell. Question What is an electron shell? Tap to flip Answer An energy level outside the nucleus that holds electrons. Question What does the atomic number of an element tell you? Tap to flip Answer The number of protons in the nucleus of each atom of that element. Question In an atom, the number of electrons equals the number of which particle? Tap to flip Answer Protons. Question What is the mass number of an atom? Tap to flip Answer The total number of protons and neutrons in its nucleus. Question What other name for the atomic number helps you remember what it counts? Tap to flip Answer The proton number. Question What is an isotope? Tap to flip Answer An atom of an element with the same number of protons but a different number of neutrons, so a different mass number. Question Why are the relative atomic masses of some elements not whole numbers? Tap to flip Answer Because of isotopes: the value is an average that takes account of how abundant each isotope is. Question What three things does standard nuclear notation show for an isotope? Tap to flip Answer The chemical symbol, the mass number and the atomic number. Question What is relative atomic mass? Tap to flip Answer The mean mass of an atom compared with 1/12 of the mass of a carbon-12 atom. Question What is relative formula mass (Mr)? Tap to flip Answer The sum of the relative atomic masses of all the atoms in a chemical formula. Question How do you work out the percentage by mass of an element in a compound? Tap to flip Answer (Relative mass of the element in the compound ÷ relative formula mass of the compound) × 100 Question When working out relative formula mass, which of an element's two periodic table numbers do you use? Tap to flip Answer The relative atomic mass, the larger of the two numbers, not the atomic number. Question How did Dalton arrange the known elements in 1803? Tap to flip Answer In order of their atomic weights. Question What pattern did Newlands notice in 1865? Tap to flip Answer When ordered by atomic mass, every eighth element had similar properties. Question Why did Mendeleev sometimes swap the order of atomic weights? Tap to flip Answer To fit elements into groups with similar properties. Question What did Mendeleev do about the gaps in his periodic table? Tap to flip Answer He predicted missing elements to fill them, and these were later discovered. Question Why could Mendeleev not explain why ordering by atomic weight was sometimes wrong? Tap to flip Answer He did not know about isotopes. Where this deck sits in the curriculum Curriculum National Curriculum for England Stage GCSE (Years 10–11) Course GCSE Chemistry Unit Atomic structure and the periodic table Exam boards AQA, Edexcel, OCR Tiers foundation and higher England's National Curriculum sets what is taught; the units and their order are Oak National Academy's. Flash Feed is not affiliated with Oak or any exam board.
How this deck was checked On 2026-11-02, every card was compared with its source: the lessons of Oak National Academy, a public body funded by England's Department for Education that publishes lessons for the national curriculum. Because the cards come from those lessons, no second source was sought. The comparison was done automatically, not by a teacher, so a card can still be wrong. Flash Feed is not affiliated with any source named here.
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A Chemistry lesson by Oak National Academy licensed under Open Government Licence (OGL)
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