Plum pudding - Study guides, Revision notes & Summaries

Joseph (JJ) Thomson - Developed "plum pudding model" Interactions in x-ray tube - Happen at atomic level Ernest Rutherford - Model resembling tiny solar system Niels Bohr - Atoms have 3 particles Protons, Neutrons, and electrons binding energy - Energy needed to split up and atom Electron binding energy depends on - How close the electron is to the nucleus and how many protons are in the atom

CEM 141 Final Exam PASSED Exam Questions and CORRECT Answers What does Thompson's plum pudding model look like? - Correct ANSWERWhat does Dalton's billard ball model look like? - Correct ANSWERWhat does Rutherford's planetary model look like? - Correct ANSWEROut of Dalton's, Rutherford's and Thompson's model, which model would support the claim that "atoms are composed of mostly empty space"? - Correct ANSWER- Rutherford's planetary model

AQA GCSE CHEMISTRY 8462/1H Paper 1 Higher Tier Version: 1.0 Final *JUN2384621H01* IB/M/Jun23/E15 8462/1H For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 10 TOTAL Monday 22 May 2023 Morning Time allowed: 1 hour 45 minutes Materials For this paper you must have: • a ruler • a scientific calculator • the periodic table (enclosed). Instructions • Use black ink or black ball-point pen. • Pencil should only be used for drawing. • Fill in the boxes at...

Mass Number - correct answer -total number of neutrons and protons in an atom; # protons + # electrons p - correct answer -Most nonmetallic elements are found in which block of the periodic table? Positive matter is concentrated in the central core - correct answer -Ernest Rutherford disproved J.J. Thomson's plum-pudding model of the atom by showing that... Potassium - correct answer -Plants use up copious amounts of which alkali metal, preventing most of it from being washed out to se...

Gen Chem 1 Final Exam Review – Saylor Questions and Answers Which of the following is a correct feature of the nuclear atom proposed by Rutherford? A) The atom is mostly empty space, most of the mass of an atom is concentrated in its nucleus. B) All atoms of an element have the same mass. C) It is like the "plum pudding" model. D) The majority of alpha particles to strike the foil "bounded back" E) The number of neutrons and electrons in the atom are equal. The atom is mostl...

Atom definition The smallest component of an element Compound Two or more elements, chemically joined in fixed proportions. They can only be separated by chemical means. Mixture Two or more elements/compounds which are not chemically combined. Ways to separate mixtures - Filtration - Evaporation - Crystallisation - Simple distillation - Fractional distillation - Paper chromatography The plum and pudding model Before electrons were discovered, people thought that atoms were indivi...

Describe the plum pudding model - A ball of positive charge with negative electrons in embedded in it Who disproved the plum pudding model and how? - Rutherford and Geiger + Marsden By conducting the gold foil experiment. Positively charged alpha particles were fired at a very thin sheet of gold foil. If the plum pudding model was correct then the charged particles would have mostly deflected off the gold foil, but most of the particles passed straight through

Rutherford's Gold Foil Experiment correct answers proposed that atoms consist of a tiny, massive, positive nucleus surrounded by electrons nucleus correct answers contains all the positive charge and nearly all the mass of the atom James Chadwick correct answers discovered the neutron cathode rays correct answers move from negative electrode to positive electrode (like electrons in a voltaic cell) Thompson's Cathode Ray Experiment correct answers discovery of the electron (also the...

What is an atom? - Ans .Smallest part of an element that can exist ▪ What is an element? - Ans .A substance made up of one type of atom ▪ How are elements represented? - Ans .Using symbols, in the periodic table ▪ Approximately how many elements are there? - Ans .100 ▪ What is a compound? - Ans .A substance made up of two or more elements chemically combined in fixed proportions ▪ How are the elements in a compound separated? - Ans .By chemical reaction ▪ How are chemical rea...

Schrodinger (1925) Continued upon Bohr's findings to determine where electrons are typically found. Heisenberg (1927) Created the heisenberg uncertainty principle because you never can predict where the electron is. (Breaking Bad) De Broglie (1924) Electrons act like waves around the atom. Niels Bohr (Bohrbit) (1913) Electrons can orbit the nucleus in certain special orbits at different energy levels around the nucleus. Earnest Rutherford (foil) (1910) Fired beam of alpha particles ...