Measurements and Math
This value is the same as 0.065 cm.
a) 0.65 mm
b) 0.065 m
c) 65 m
d) 0.0065 mm
What is 0.65 mm?
This nuclear particle has about the same mass as a proton, but with no charge.
What is a neutron?
This is the name for the horizontal rows on the periodic table.
What are periods?
Valence electrons are the s- and p- electrons located in this part of an atom.
What is the highest or outermost energy level?
The name for the number of atoms in one mole of any pure substance, equal to 6.022 x 10²³.
What is Avogadro's number?
This is the number of significant figures in the measured valued of 0.0087630 kg.
What is 5?
This term describes the total number of protons and neutrons in an atom's nucleus.
a)mass number
b)average atomic mass
c)Avogadro's number
d) atomic number
What is the mass number?
This is the common name for the elements found in Group 1.
What are the alkali metals?
This is the specific name for a negative ion.
What is an anion?
This is the number of atoms present in exactly 1 mole of carbon.
What is 6.022 x 1023 atoms?
This is the correctly recorded answer when 6.5 m is divided by 3 s, respecting significant figures.
What is 2 m/s?
Because most particles fired at gold foil passed straight through, Rutherford reached this conclusion about the nature of atoms.
a) electrons formed the nucleus.
b) atoms contained no charged particles.
c) atoms are indivisible.
d) atoms are mostly empty space.
What is that atoms are mostly empty space?
This property is defined as one-half the distance between the nuclei of identical atoms that are bonded together.
What is atomic radius?
This is the molecular shape for CCl₄.
What is tetrahedral?
This is the term for the process of splitting the nucleus of a large atom into two or more fragments.
What is nuclear fission?
This is the density of 67.55 g of material that has a volume of 8.30 cm3.
What is 8.14 g/cm3?
Isotopes are atoms of the same element that have different these.
a) numbers of protons.
b) different chemical properties
c) numbers of electrons
d) masses.
What are masses?
Among the choices provided, this element possesses the greatest electronegativity.
a) oxygen
b) sodium
c) chlorine
d) fluorine
What is fluorine?
This is the correct electron configuration for a sulfur atom.
What is 1s²2s²2p⁶3s²3p⁴?
This particle correctly balances the nuclear equation for the decay of Radium-226 into Radon-222: ²²⁶₈₈Ra → ²²²₈₆Rn + ___.
What is ⁴₂He?
What is 3.27 km?
These are the respective numbers of protons, neutrons, and electrons in the ion ⁴⁸₂₂Ti²⁺.
What is 22 protons, 26 neutrons, and 20 electrons?
This is the general trend for atomic radius when moving front left to right across a period in the periodic table.
What is the trend that atomic radius decreases?
This is why the melting points of ionic compounds are higher than the melting points of molecular compounds.
What is because the attractive forces between ions are stronger than the attractive forces between molecules?
This is the amount of an original 0.520 g sample of radium-226 that remains after 4797 years, given its half-life of 1599 years.
What is 0.0650 g?