Neutrons were discovered by ________.
A. Thomson
B. Chadwick
C. Rutherford
D. Goldstein
Answer: B
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Chemistry Test
- A _________ is a particle of electromagnetic radiation having zero mass and carrying a quantum of energy.
- _______ describes mathematically the wave properties of electrons and other very small particles.
- _______ is the distance between corresponding points on adjacent waves.
- This scientist is credited with first proposing a dual wave-particle nature for the electron?
- The nucleus of an atom was discovered by ____________.
- _______ first proposed the plum-pudding model of the atom.
- English physicist JJ Thomson discovered the ___________.
- The first person to measure the charge of an electron was ___________.
- _______ refers to the closeness of measurements to the correct or accepted value of the quantity measured.
- ________ is the amount of space occupied by an object.
- The lowest energy state of an atom is its ____________.
- Atoms of the same element with different masses are called __________.
- The atomic number of an element is the number of _________ in each atom of that element.
- The scientist's atomic theory was a starting point for many later discoveries about the atom.
- The law of _______________ states that if two or more different compounds are composed of the same two elements, then the ratio of the masses of the second element combined with a certain mass of the first element is always a ratio of small whole numbers.
- The substances formed by a chemical reaction are called _______________.
- A ____________ property relates to a substance's ability to undergo changes that transform it into different substances.
- A solid has a definite shape and ________
- A(n)_____ is the smallest unit of an element that maintains that chemical identity of that element.
- Matter is _______________.
- A ______ of energy is the minimum quantity of energy that can be lost or gained by an atom.
- The Group 18 elements are called the
- The _____ effect refers to the emission of electrons from a metal when light shines on the metal.
- A _______ is a particle of electromagnetic radiation having zero mass and carrying a quantum of energy.