quimica 10º Flashcards
What is the smallest unit of matter?
Atom
True or False: Atoms can be divided into smaller particles.
True
What are the three main subatomic particles in an atom?
Protons, neutrons, and electrons
Fill in the blank: The number of protons in an atom determines its __________.
Element
Which particle has a positive charge?
Proton
What is the charge of an electron?
Negative
What is the term for atoms of the same element with different numbers of neutrons?
Isotopes
What is the atomic number?
The number of protons in the nucleus of an atom
Multiple Choice: Which of the following is not a chemical element? A) Oxygen B) Water C) Carbon
B) Water
True or False: All isotopes of an element have the same chemical properties.
True
What is the mass number of an atom?
The total number of protons and neutrons in the nucleus
Fill in the blank: Elements are organized in the __________ table.
Periodic
What is a molecule?
A group of two or more atoms bonded together
Multiple Choice: Which particle is found in the nucleus of an atom? A) Electron B) Proton C) Photon
B) Proton
What determines the chemical behavior of an element?
The arrangement of its electrons
True or False: Neutrons have no charge.
True
What is the term for a substance made of only one type of atom?
Element
Fill in the blank: The outermost electrons of an atom are called __________ electrons.
Valence
What is a chemical bond?
A force that holds atoms together in a molecule
Multiple Choice: Which of the following is a noble gas? A) Helium B) Nitrogen C) Oxygen
A) Helium
What happens during a chemical reaction?
Atoms are rearranged to form new substances
