The electrons in the highest principal energy level of an atom are called ______________ electrons.
Hydrogen has this many valence electrons.
Aluminum has this many valence electrons.
Iodine has this many valence electrons.
Gallium is in this row of the periodic table.
Which element is in the p-block group of elements in the periodic table(choose all that apply)?
Which of the following elements are s-block elements(choose all that apply)?
Which of the following elements are f-block elements(choose all that apply)?
Scandium is a d-block element with how many electrons in the d orbital?
Phosphorus is an p-block element with how many electrons in the p orbital?
In ___________, Antoine Lavoisier defines the chemical element, develops a list of all known elements, and distinguishes between metals and nonmetals.
In 1969, researchers at the University of Berkeley synthesize the first element heavier than the actinides it has a half-life of 4.7 seconds and is named ______________________.
In 1913, _________________________ determines the atomic number of known elements and establishes that element properties vary periodically with atomic number.
Using the periodic table, determine the group given the following electron configuration [He] 2s2.
Using the periodic table, determine the period given the following electron configuration [He] 2s2.
Using the periodic table, determine the group given the following electron configuration [Ne] 3s2.
Using the periodic table, determine the group given the following electron configuration [Ne] 3s2 3p4.
Using the periodic table, determine the period given the following electron configuration [Ne] 3s2 3p4.
Given the electron configuration of 1s2 2s2 2p6 3s2 3p5, which element does this represent?
Given the electron configuration of [Kr] 5s1, which element does this represent?