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by BlastRoom
Work out where protons, neutrons and electrons sit in an atom, what they weigh and what charge they carry.
#us_grade_8_science
40 questions
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An atom of sodium has an atomic number of 11 and a mass number of 23. How many neutrons are in the nucleus of this atom?
A neutral atom of aluminum has an atomic number of 13 and a mass number of 27. How many electrons move in the space around its nucleus?
The nucleus of a carbon atom holds 6 protons and 6 neutrons. What is the mass number of this atom?
A potassium atom has 19 protons and 20 neutrons and no overall charge. How many electrons does it have?
An atom of fluorine has an atomic number of 9 and a mass number of 19. How many particles altogether are packed into its nucleus?
A phosphorus atom has a mass number of 31 and 16 neutrons in its nucleus. What is the atomic number of this atom?
An atom of copper has an atomic number of 29 and a mass number of 63. How many neutrons does its nucleus contain?
An atom of chlorine has an atomic number of 17 and a mass number of 35. How many protons are in this atom?
An iron atom has 26 protons and 30 neutrons. What is the mass number of this atom?
A neutral neon atom has 10 electrons and 10 neutrons. What is its mass number?
An atom of boron has an atomic number of 5 and a mass number of 11. How many neutrons are in its nucleus?
A model of an oxygen atom shows 8 protons, 8 neutrons and 8 electrons. What is the mass number of that atom?
Where in an atom is almost all of its mass found?
Which region of an atom takes up almost all of its volume?
A student is drawing a model of a carbon atom and has to place its six neutrons. Where do the neutrons belong?
Where in an atom is all of its positive charge found?
Where in an atom is its negative charge found?
A magnesium atom transfers one particle to a nearby atom and becomes positively charged. From which region of the magnesium atom did that particle leave?
Alpha particles are fired at thin gold foil. Most pass straight through, but a few bounce sharply backward. Which part of a gold atom turned those few back?
One model of an atom puts a marble on the center spot of an empty stadium. What does the stadium's empty air stand for?
A scientist wants to know which element an unknown atom is. Which count alone tells her the answer?
A student is drawing a neutral sodium atom with 11 protons, 12 neutrons and 11 electrons. Where must the 11 electrons be drawn?
An atom with no overall charge takes part in a reaction. Afterward the same atom has an overall charge of 1-. Which change produced that charge?
A neutral calcium atom ends up with an overall charge of 2+. Which change to its particles produced that charge?
A sodium atom becomes a particle with a charge of 1+, and its mass barely changes at all. Which change fits both pieces of evidence?
A particle contains 17 protons and 18 electrons. What is its overall charge?
A particle contains 12 protons, 12 neutrons and 10 electrons. What is its overall charge?
A neutral atom shows no overall charge even though it contains charged particles. What explains the zero charge?
A neutral chlorine atom with 17 protons gains one electron. What happens to the number of protons in its nucleus?
A neutral oxygen atom has 8 protons and 8 electrons. After a reaction it carries a charge of 2-. How many electrons does it have now?
A plastic rod rubbed with a wool cloth becomes negatively charged and picks up small paper scraps. Which particles moved onto the rod during the rubbing?
A magnesium atom with mass number 24 loses two electrons but keeps 12 protons and 12 neutrons. What happens to its mass number?
An atom is measured as neutral, then as 3+ after a reaction, with no change in mass number. How many electrons did the atom lose?
A science text says about 1,800 of one subatomic particle are needed to match the mass of a single proton. Which particle is that light one?
Which two particles in an atom have almost exactly the same mass as each other?
An electron carries a charge of 1-. Which particle carries a charge of the same size but opposite sign?
A helium nucleus holds 2 protons and 2 neutrons. A hydrogen nucleus holds 1 proton. How do the two nuclear masses compare?
Mass number counts an atom's protons and neutrons but leaves out its electrons. Why are the electrons left out?
One extra neutron is added to the nucleus of an atom. Which property of the atom changes?
In one model, an atom's nucleus is a pea placed at the center of a football field, with the electrons out near the stands. What does this model show?
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Atoms and the Periodic Table: Key Terms in Use
20 questions
