Atoms Flashcards
(27 cards)
what is in nuclear
protons and neutrons
What is the smallest unit of an element?
An atom.
True or False: Atoms can be seen with the naked eye.
False.
Fill in the blank: Atoms are made up of protons, neutrons, and __________.
electrons.
What charge do protons carry?
Positive charge.
What is the charge of neutrons?
No charge (neutral).
Which particle orbits the nucleus of an atom?
Electrons.
What is the nucleus of an atom composed of?
Protons and neutrons.
How many electrons can the first shell of an atom hold?
2 electrons.
What is the atomic number of an element?
The number of protons in its nucleus.
True or False: All atoms of an element are identical.
True.
What is an isotope?
Atoms of the same element with different numbers of neutrons.
Fill in the blank: The mass number of an atom is the sum of its __________ and __________.
protons and neutrons.
What do you call the arrangement of electrons in an atom?
Electron configuration.
What is the outermost shell of an atom called?
Valence shell.
Multiple Choice: What determines the chemical properties of an element? A) Number of neutrons B) Number of protons C) Number of electrons
C) Number of electrons.
What is the term for an atom that has gained or lost electrons?
Ion.
True or False: All isotopes of an element have the same chemical behavior.
True.
What is the significance of the periodic table?
It organizes elements based on their atomic number and properties.
Fill in the blank: Elements in the same group of the periodic table have similar __________.
chemical properties.
What is a molecule?
A group of two or more atoms bonded together.
What is a compound?
A substance formed when two or more different elements chemically bond.
Multiple Choice: Which particle has the least mass? A) Proton B) Neutron C) Electron
C) Electron.
What does the term ‘atomic mass’ refer to?
The weighted average mass of an atom’s isotopes.
