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AP CHEMISTRY UNIT 1 ( Latest 2024 / 2025 ) Actual Questions and Answers 100% Correct
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AP CHEMISTRY UNIT 1 ( Latest 2024 / 2025 ) Actual Questions and Answers 100% Correct
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AP CHEMISTRY UNIT 11. Subatomic Particles: Particles such as protons, neutrons, and electrons thatare smaller
than an atom.
2. Cathode Rays: Streams of electrons that are produced when a high voltage isapplied to
electrodes in an evacuated tube.
3. Radioactivity: The process in which an unstable atomic nucleus emits chargedparticles and
energy.
4. Nucleus: The very small, very dense positively charged portion of the atom; itis
composed of protons and neutrons.
5. Proton: A positively charged subatomic particle found in the nucleus of the atom.
6. Neutron: An electrically neutral particle found in the nucleus of an atom; it has
approximately the same mass as a proton.
7. Electron: A negatively charged subatomic particle found outside the atomicnucleus; it is a
part of all atoms and has 1/1836 the mass of a proton.
8. Electronic Charge: The negative charged carried by an electron; it has amagnitude of
1.602 x 10^-19 C.
9. Atomic Mass Unit (amu): A unit based on the value of exactly 12 amu for themass of an
isotope of carbon that has six protons and six neutrons in the nucleus.
10. Angstrom: A common non-SI unit of length denoted Å, that is used to measureatomic
dimensions: 1 Å = 10^-10m.
11. Atomic Number: The number of protons in the nucleus of an atom of anelement.
12. Mass Number: The sum of the number of protons and neutrons in the nucleusof a
particular atom.
13. Atomic Weight: The average mass of the atoms of an element in atomic massunits (amu);
it is numerically equal to the mass in grams of one mole of the element.
14. Mass Spectrometer: An instrument used to measure the precise masses andrelative
amounts of atomic and molecular ions.
15. Periodic Table: The arrangement of elements in order of increasing atomicnumber, with
elements having similar properties placed in vertical columns.
16. Period: The row of elements that lie in a horizontal row in the periodic table.
17. Group: Elements that are in the same column of the periodic table; elementswithin the
same group or family exhibit similarities in their chemical behavior.
18. Metal: Elements that are usually solids at room temperature, exhibit high elec-trical and
heat conductivity, and appear lustrous.
19. Nonmetal: Elements in the upper right corner of the periodic table; nonmetalsdiffer from
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