Atoms Flashcards
Which of these elements is most likely to be a good conductor of electricity?
Fe
An atom of the isotope sulfur-31 consists of how many protons, neutrons, and electrons? (p = proton, n = neutron, e = electron)
16 p, 15 n, 16 e
Which one of the following statements about atoms and subatomic particles is correct?
A neutral atom contains equal numbers of protons and electrons.
Which of the following is a metalloid?
germanium, Ge, Z = 32
Which of these elements is chemically similar to oxygen
sulfur
How many protons and electrons are present in one Br- ion?
35 p, 36 e
Which of these elements is chemically similar to magnesium?
calcium
An oxide ion, O2-, has:
8 protons and 10 electrons
A magnesium ion, Mg2+, has:
12 protons and 10 electrons
Almost all the mass of an atom is concentrated in the nucleus.
true
Atoms of the same element with different mass numbers are called
isotopes
An aluminum ion, Al3+, has:
13 protons and 10 electrons
Which of the following is a non-metal?
bromine, Br, Z = 35
Two isotopes of an element differ only in their
atomic mass
Which of the following is a metal?
thallium, Tl, Z = 81
