Atomic Structure (QUIZ 2) Flashcards
To know that: The structure of an atom - there are three basic particles in the atom (proton, neutron, electron).
What is the smallest unit of matter?
A) cell
B) nucleus
C) atom
D) electron
C) atom
Atoms are the smallest unit of matter and can be classified as living or non-living. Based on this statement, the following are composed of atoms, except:
A) a virus
B) DNA (deoxyribonucleic acid)
C) sand grains
D) a rainbow
E) none of the above
D) a rainbow
How big are atoms (which order of magnitude)?
A) milligram (10-3)
B) microgram (10-6)
C) nanogram (10-9)
D) picogram (10-12)
C) nanogram (10-9)
Which of the following has a positive charge?
(a) proton
(b) neutron
(c) atom
(d) electron
(a) proton
Which determines the identity of an atom?
A) number of electrons
B) number of protons
C) number of electrons
C) atomic mass
D) atomic radius
B) number of protons
The atomic number of the element sodium is 11. How many electrons does a non-ionic sodium atom have?
A) 10
B) 11
C) 12
D) 22
B) 11
Atoms are overall neutral**, but a single atom can contain many **negatively charged electrons. What does this imply about the nucleus?
A) It must be electrically neutral (no net charge).
B) It must bear a positive charge equal in magnitude to the total charge of the atom’s electrons.
C) It must bear a negative charge equal in magnitude to the total charge of the atom’s electrons.
B) If the atom contains many negatively charged electrons but is overall charge-neutral, it implies that there must be other positively charged particles that balance out the electrons. The nucleus contains two different kinds of particles.
Most of the volume of the atom is composed of:
A) the nucleus
B) the electrons
C) empty space
D) energy shells
C) empty space
The subatomic particle shown above with a positive charge is _____.
A) a proton
B) a neutron
C) an electron
D) a quark
A) a proton
From the diagram of a neutral atom, which of the following is a correct inference?
A) For every positive charge there is a neutral charge.
B) For every neutral charge there is a negative charge.
C) For every positive charge there is a negative charge.
D) None of these statements is correct.
C) For every positive charge there is a negative charge.
What is the subatomic particle without an electric charge?
A) neutron
B) electron
C) proton
D) valence electron
A) neutron
Most of the mass of an atom is made up of _____.
A) protons and electrons
B) protons and neutrons
C) neutrons and electrons
D) electrons and quarks
B) protons and neutrons
In order for an atom to be neutral what has to be true?
A) the atom has more protons than neutrons
B) the atom has the same number of protons and neutrons
C) the atom has more neutrons than protons
D) the atom has the same number of protons and electrons
D) the atom has the same number of protons and electrons
How is the number of neutrons in the nucleus of an atom calculated?
A) the sum of the number of electrons and protons
B) the difference between the mass and the number of protons
C) the difference between the number of electrons and neutrons
D) the sum of the mass and the electrons
B) the difference between the mass and the number of protons
What subatomic particles would you find in the nucleus of an atom?
A) protons only
B) neutrons and electrons
C) protons and neutrons
D) protons and electrons
C) protons and neutrons
The diagram represents a neutral atom of which element?
A) La
B) Sc
C) Al
D) none of the above
C) Al
The diagram represents a neutral atom of which element?
A) fluorine
B) chlorine
C) radium
D) none of the above
A) fluorine
The diagram represents a neutral atom of which element?
lithium
The diagram represents a neutral atom of which element?
hydrogen
The diagram represents a neutral atom of which element?
carbon
The diagram represents a neutral atom of which element?
helium
