1. Which of the following was NOT among Democritus\'s ideas? A.) Matter consists
ID: 739934 • Letter: 1
Question
1. Which of the following was NOT among Democritus's ideas?A.) Matter consists of tiny particles called atoms.
B.) Atoms are indivisible.
C.) Atoms retain their identity in a chemical reaction.
D.) Atoms are indestructible.
2. Which of the following was originally a tenet of Dalton's atomic theory, but had to be revised about a century ago?
A.) Atoms are tiny indivisible particles.
B.) Atoms of the same element are identical.
C.) Compounds are made by combining atoms.
D.) Atoms of different elements can combine with one another in simple whole number ratios.
3. The comparison of the number of atoms in a copper coin the size of a penny with the number of people on Earth is made to illustrate which of the following?
A.) that atoms are indivisible
B.) that atoms are very small
C.) that atoms are very large
D.) that in a copper penny, there is one atom for every person on Earth
4. Which of the following is true about subatomic particles?
A.) Electrons are negatively charged and are the heaviest subatomic particle.
B.) Protons are positively charged and the lightest subatomic particle.
C.) Neutrons have no charge and are the lightest subatomic particle.
D.) The mass of a neutron nearly equals the mass of a proton.
5. The nucleus of an atom is _____.
A.) the central core and is composed of protons and neutrons
B.) positively charged and has more protons than neutrons
C.) negatively charged and has a high density
D.) negatively charged and has a low density
6. An element has an atomic number of 76. The number of protons and electrons in a neutral atom of the element are ____.
A.) 152 protons and 76 electrons
B.) 76 protons and 0 electrons
C.) 38 protons and 38 electrons
D.) 76 protons and 76 electrons
7. Isotopes of the same element have different _____.
A.) numbers of neutrons
B.) numbers of protons
C.) numbers of electrons
D.) atomic numbers
8. The mass number of an element is equal to _____.
A.) the total number of electrons in the nucleus
B.) the total number of protons and neutrons in the nucleus
C.) less than twice the atomic number
D.) a constant number for the lighter elements
9. Which of the following isotopes has the same number of neutrons as phosphorus-31? (atomic number 15) (1 point)
A.) 32/15 P
B.) 32/16 S
C.) 29/14 SI
D.) 28/14 SI
10. Which of the following equals one atomic mass unit?
A.) the mass of one electron
B.) the mass of one helium-4 atom
C.) the mass of one carbon-12 atom
D.) one-twelfth the mass of one carbon-12 atom
11. The atomic mass of an element depends upon the _____.
A.) mass of each electron in that element
B.) mass of each isotope of that element
C.) relative abundance of protons in that element
D.) mass and relative abundance of each isotope of that element
12. In the Bohr model of the atom, an electron in an orbit has a fixed _____.
A.) position
B.) color
C.) energy
D.) size
13. The principal quantum number indicates what property of an electron?
A.) position
B.) speed
C.) energy level
D.) electron cloud shape
14. When an electron moves from a lower to a higher energy level, the electron _____.
A.) always doubles its energy
B.) absorbs a continously variable amount of energy
C.) absorbs a quantum of energy
D.) moves closer to the nucleus
15. If three electrons are available to fill three empty 2p atomic orbitals, how will the electrons be distributed in the three orbitals?
A.) one electron in each orbital
B.) two electrons in one orbital, one in another, none in the third
C.) three in one orbital, none in the other two
D.) Three electrons cannot fill three empty 2p atomic orbitals.
16. Which electron configuration of the 4f energy sublevel is the most stable?
A.) 4f7
B.) 4f
C.) 4f13
D.) 4f14
17. The modern periodic table is arranged in order of increasing atomic _____.
A.) mass
B.) charge
C.) number
D.) radius
18. To what category of elements does an element belong if it is a poor conductor of electricity?
A.) transition elements
B.) metalloids
C.) nonmetals
D.) metals
19. Which of the following groupings contains only representative elements?
A.) Cu, Co, Cd
B.) Ni, Fe, Zn
C.) Al, Mg, Li
D.) Hg, Cr, Ag
20. Atomic size generally _____.
A.) Vincreases as you move from left to right across a period
B.) decreases as you move from top to bottom within a group
C.) remains constant within a period
D.) decreases as you move from left to right across a period
21. Which of the following statements is true about ions?
A.) Cations form when an atom gains electrons.
B.) Cations form when an atom loses electrons.
C.) Anions form when an atom gains protons.
D.) Anions form when an atom loses protons.
22. Which is the element with the highest electronegativity value?
A.) cesium
B.) helium
C.) calcium
D.) fluorine
Explanation / Answer
d a c c a b d c a b c b a c b a d c c a b c
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