Atoms
What are the two parts of an atom?
What is nucleus and electron cloud.
Who is known as the "father of modern chemistry” because he first organized all known elements into four different groups?
Who is Antoine Lavoisier.
While looking at xenon (Xe) on the periodic table, a student needs to find an element with a smaller atomic mass in the same group. Where should the student look?
What is directly up.
Which atom is most likely to form a metallic bond?
What is aluminum (Al)
It can have different compositions, and it has a set of characteristics that does change.
What is a Mixture
When an atom that has no charge loses two electrons, it becomes a?
What is a positive ion.
Which element is least likely to form chemical bonds?
What is Helium.
Rounded to the nearest whole number, what is the atomic mass of platinum?
What is 195.
How would an electron shell model of an oxygen atom (O) appear after the atom has formed chemical bonds
What is It would have eight electrons in the outermost shell
Which material is the least likely to be recognized as a mixture by looking at it under a microscope? a suspension, a colloid, a homogeneous mixture, or a heterogeneous mixture.
What is a homogeneous mixture.
An atom of the element zinc has an atomic number of 30 and a mass number of 65. How many protons does an uncharged zinc atom have?
What is 30.
In an element’s square on the periodic table, the number with the greatest numerical value represents the?
What is the atomic mass.
The elements in group 17 of the periodic table are all called halogens. All halogens have the same?
What are number of valence electrons.
What refers to the type of chemical bond that involves the transfer of electrons between atoms?
What is ionic.
True or false: Each compound is composed of one type of molecule.
What is true.
Atom A and Atom B have the same number of protons, but they do not have the same number of neutrons. Which statement describes these atoms? Atom A and Atom B are isotopes of the same element., Atom A and Atom B are different elements., Atom A and Atom B have different atomic numbers, Atom A and Atom B have the same mass number.
What is Atom A and Atom B are isotopes of the same element
The symbol P represents the element phosphorus. This element’s atomic number is 15. How many protons and electrons are in a P–3 ion?
What is 15 protons and 18 electrons.
The chemical symbol for the element calcium is Ca. What would be the symbol representing calcium atoms that have lost two electrons?
What is Ca+2
Based on the location of nitrogen (N) on the periodic table, how many additional electrons does a nitrogen atom need in its valence shell to satisfy the octet rule when it forms bonds?
What is 3
Lists mixtures, in order, from the smallest particles to the largest particles?
What are solution, colloid, suspension.
What does the octet rule state that explains why atoms bond?
What is An atom bonds to have eight valence electrons to become stable
How many atoms of each element are in the chemical formula NH4NO3?
What is 2 nitrogen, 4 hydrogen, and 3 oxygen.
Elements in group 2 are all called alkaline earth metals. What is most similar about the alkaline earth metals?
What is which chemical properties they have
Which element’s symbol could replace the question mark in the diagram?
What is arsenic (As)
Why is a compound considered a pure substance?
What is A compound is a pure substance because its molecule cannot be broken down into simpler particles by physical means.