A liquid is cooled during an investigation causing it to solidify. Which of the following most likely occurred?

Which of the following observations is usually not evidence of a chemical change?

Which phase of matter is the least compressible?

Water (H₂O) is best described as a(n)

After a jar of muddy water is shaken vigorously, the dirt eventually sinks to the bottom. When a flashlight shines into the jar of muddy water, a beam of light reflects off the small particles of soil suspended in the water. How is the muddy water classified?

Dmitri Mendeleev was one of the first scientists to arrange the known elements into an organized table. His arrangement, which was by increasing atomic mass, had holes and some elements' chemical and physical behavior did not match with other elements in the same group. Many years later, Henry Moseley arranged the periodic table according to increasing atomic number. What happened to the problems and holes Mendeleev experienced when the elements were arranged by increasing atomic number?

Why is iodine found after tellurium on the Periodic Table even though its average atomic mass is lower for iodine?

On Mendeleev's Periodic Table, two spaces were left empty because those elements had not yet been discovered. He predicted that one of the elements would be found to have an atomic mass between that of zinc and arsenic and would behave chemically like silicon. He suggested it be called "ekasilicon". What is the current name of this element?

Elements that have been placed in the same group on the Periodic Table share what properties?

Alkali metals and elements in the halogen group bond well together. Which of the following conclusions can be drawn about these two groups of elements on the periodic table?

Scientists have synthesized elements with atomic numbers as high as 118. If they succeed in synthesizing element number 119, what properties would this element be expected to have at room temperature?

Which elements are grouped together because they share these properties? - chemically inert - very low boiling point - full valence shell - very high ionization energy

Soft silvery metal elements with 2 valence electrons would be called

With respect to physical and chemical properties, which element is most similar to oxygen?

With respect to physical and chemical properties, which element is most similar to calcium?

Based on the information in the chart below, which element is most likely a member of Group 18?

Which of the following group of elements have the most similar chemical properties?

Atomic radius increases down a group because

When examining periodic trends of element families, the least electronegative elements are most likely found in the

On the Periodic Table, what are the group and period trends in ionization energy (IE)?

When examining the chemical nature of elements, which of the following has atoms with the highest electronegativity?

When examining periodic trends, the elements with the largest atomic radii are most likely found in the

Which of the following has the lowest ionization energy?

Using the table of Electronegativity below, determine which of the following trends, in a period of the periodic table, is best supported by the data?

Which of the following is the most reactive nonmetal?

The discovery of subatomic particles in 1897 opened an exciting new era in science. Experiments conducted to determine atomic structure made it necessary to modify our model of how atoms are constructed. Who proposed the atomic model shown below?

Based on the diagram below, rank these electromagnetic waves in order of increasing wavelength.

Chromium has four naturally abundant isotopes. Based on its average atomic mass, if 4.35% is Cr-50, 9.50% is Cr-53, and 2.36% is Cr-54, which isotope constitutes the majority 83.79%?

Chlorine has two naturally abundant isotopes. Based on its average atomic mass, if 75.77% is Cl-35, which isotope constitutes the other 24.23%?

Germanium has five naturally occurring isotopes. Based on its average atomic mass, if 20.5% is Ge-70, 27.4% is Ge-72, 7.8% is Ge-73 and 7.8% is Ge-76, which isotope constitutes the majority 36.5%?

Silver occurs as two isotopes. The most common isotope, silver -108, comprises 51.8% of a sample of silver. What is the atomic mass of the other isotope?

A certain element sample is analysed and found to consist of 11% of isotope X with a mass of 26 u, 10% of isotope Y with a mass of 25 u, and 79% of isotope Z with a mass of 24 u. What is the average atomic mass of the element?

What element has the electron configuration 1s² 2s² 2p⁶ 3s² 3p⁴?

What element has the electron configuration [Ar] 3d⁵ 4s²?

What is the maximum number of electrons found on an f orbital?

What is the maximum number of electrons that can be found on a p orbital?

What is the maximum number of electrons found on an s orbital?

Which of the following is not a correct electron configuration for a noble gas?

The electron configuration for boron is 1s² 2s² 2p¹. How many valence electrons do atoms of boron have?

Which of the following is the correct electron configuration for oxygen?

All of the halogens have the same number of valence electrons. Therefore, their electron configurations will be alike in that they all end in

What element would have the electron configuration 1s² 2s² 2p⁶ 3s²?

Which of the following electron configurations represents an alkali metal?

Which electron configuration represents an element with three valence electrons?

Which of the following electron configurations represents an alkaline earth metal?

Which electron configuration represents an atom with six valence electrons?

Which electron configuration represents an element in the same family as oxygen?

Which element is represented with an electron configuration of [Kr]5s²4d¹⁰5p²?

Emission of gamma radiation ____.

What type of radioactive particle is emitted as the product of the decay process below?

The first transuranium element, neptunium, was synthesized from uranium-238 in a 2-step process shown below. The first step in the process is neutron capture. The second step is —

Radioactive uranium-238 undergoes spontaneous decay as shown in the following equation. What is the mass number of the thorium isotope produced in this decay process?

A gamma ray is best described as having

One characteristic that fusion and fission share is that

Compared to nuclear fission, nuclear fusion

Which term describes the formation of a more massive nucleus by the combination of two lighter nuclei?

Which best describes the break-up of a nucleus into two nuclei of roughly similar masses?

From which of the following atoms would it be the most difficult to remove an electron?

Rubidium has a lower ionization energy than sodium. One reason for this is that the —

Scientists, including Ernest Rutherford, started testing atomic structure theory in the early 1800's. What was Rutherford's key contribution to the atomic theory of matter?

What does the following hyphen notation of Helium-3 mean?