Atoms, Elements, and Compounds Quiz

True (A)

Protons and neutrons

<p>cathode</p> Signup and view all the answers

<p>J.J. Thomson = Proposed the 'plum pudding' model Ernest Rutherford = Discovered the nucleus through alpha particle scattering experiment Niels Bohr = Proposed a model with electrons orbiting the nucleus in quantized energy levels</p> Signup and view all the answers

<p>Compounds are formed by the chemical combination of two or more elements. (C)</p> Signup and view all the answers

<p>It revealed that the atom has a small, dense, positively charged nucleus at the center, surrounded by negatively charged electrons.</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>fixed</p> Signup and view all the answers

<p>Proton (A)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Niels Bohr</p> Signup and view all the answers

<p>Rutherford's scattering experiment</p> Signup and view all the answers

<p>Electrons can exist in any energy level. (C)</p> Signup and view all the answers

<p>Niels Bohr = Proposed a model of the atom with electrons orbiting the nucleus in specific energy levels. Electronic Shell = An energy level where electrons reside in an atom. Max number of Electrons = The maximum number of electrons that can occupy a particular energy level. Experimental Observations = Evidence gathered from experiments that support or refute scientific theories.</p> Signup and view all the answers

<p>1</p> Signup and view all the answers

<p>James Chadwick = Discovered the neutron Ernest Rutherford = Developed the nuclear model of the atom J.J. Thomson = Proposed the plum pudding model of the atom</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Energy levels or shells</p> Signup and view all the answers

<p>The existence of neutrons (D)</p> Signup and view all the answers

<p>True (A)</p> Signup and view all the answers

<p>experimental</p> Signup and view all the answers

<p>Plum pudding model</p> Signup and view all the answers

<p>Predicted the existence of isotopes. (B)</p> Signup and view all the answers

<p>electron</p> Signup and view all the answers

<p>The number of protons in the atom (C)</p> Signup and view all the answers

<p>Electrons are located in the center of the atom. (E)</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>Filtration (C)</p> Signup and view all the answers

<p>proton</p> Signup and view all the answers

<p>False (B)</p> Signup and view all the answers

<p>empty space</p> Signup and view all the answers

<p>Atomic number = The number of protons in an atom Mass number = The sum of protons and neutrons in an atom Electron = A negatively charged particle that orbits the nucleus Neutron = A neutral particle found in the nucleus of an atom Proton = A positively charged particle found in the nucleus of an atom</p> Signup and view all the answers

<p>Simple distillation</p> Signup and view all the answers

<p>chemical symbols</p> Signup and view all the answers

<p>Filtration = Separating an insoluble solid from a liquid Crystallisation = Separating a solid from a solution Simple distillation = Separating a solvent from a solution Word equation = Describing a reaction using words Symbol equation = Representing a reaction using chemical symbols and formulas</p> Signup and view all the answers

An early atomic model proposing electrons are embedded in a positive 'soup'.

Identified small negatively charged particles within atoms.

Describes the atom with a central positive nucleus surrounded by electrons.

Positively charged particles found in the nucleus of an atom.

Neutral particles found alongside protons in the nucleus.

Regions around the nucleus that contain electrons.

Processes that chemically combine or separate elements and compounds.

Substances consumed and produced in a chemical reaction.

Total mass of reactants equals total mass of products.

Method to separate an insoluble solid from a liquid.

Process to obtain pure crystals from a solution.

Use symbols to represent chemical reactions.

A theory proposing electrons orbit the nucleus in fixed shells.

Defined paths where electrons orbit the nucleus at specific distances.

The maximum number of electrons in a shell increases with each shell level.

Describes the negative charge of electrons, positive of protons.

Electrons have a mass approximately 1/1836 that of a proton.

The central part of an atom, containing protons and neutrons.

Observations and experiments that validate Bohr's theory.

The path that an electron follows around a nucleus in an atom.

The year when Bohr proposed his model, 1913.

A negatively charged subatomic particle orbiting the nucleus.

Process of forming a conceptual framework for atomic structure.

Scientist who discovered neutrons and contributed to atomic theory.

An experiment demonstrating the structure of the atom using alpha particles.

Helium nuclei emitted by radioactive materials, used in scattering experiments.

The relative electrical charge of a proton is +1.

The relative electrical charge of an electron is -1.

Rutherford's experiment that revealed the nucleus's structure.

The arrangement of protons, neutrons, and electrons in an atom.

The total number of protons and neutrons in an atomic nucleus.

The number of protons in the nucleus of an atom; it determines the element's identity.

The number of electrons in a neutral atom equals the number of protons.

Alpha particles are repelled by the positive charge in a nucleus during experiments.

Two or more substances combined physically but not chemically.