The idea of arranging the elements in the periodic table according to their chemical and physical properties is attributed to
Mendeleev left spaces in his periodic table and predicted the existence of three elements and their
Mendeleev noticed that properties of elements usually repeated at regular intervals when the elements were arranged in order of increasing
Mendeleev did not always list elements in his periodic table in order of increasing atomic mass because he grouped together elements with similar
Moseley's work led to the realization that elements with similar properties occurred at regular intervals when the elements were arranged in order of increasing
permits the properties of an element to be predicted before the element is discovered.
The periodic table
Evidence gathered since Mendeleev's time indicates that a better arrangement than atomic mass for elements in the periodic table is an arrangement by
The periodic law states that the physical and chemical properties of elements are periodic functions of their atomic
number of protons
The periodic law states that the properties of elements are periodic functions of their atomic numbers. What determines the position of each element in the periodic table?
the periodic law
The principle that states that the physical and chemical properties of the elements are periodic functions of their atomic numbers is
position of the periodic table
The periodic law allows some properties of an element to be predicted based on its
the physical and chemicla properties of the elements are hte functions of their atomic numbers.
The periodic law states that
The atomic number of lithium, the first element in Group 1, is 3. The atomic number of the second element in this group is
How much greater is the atomic number of the fourth element in groups 1, 2 and 18 than the preceding element?
Krypton, atomic number 36, is the fourth element in Group 18. What is the atomic number of xenon, the fifth element in Group 18?
Barium, atomic number 56, is the fifth element in Group 2. What is the atomic number of radium, the next element in Group 2?
For elements in groups 1, 2, and 18, the increase in atomic number for successive elements follows the pattern 8, 8, 18, ?, 32. What number completes the pattern?
The electron configuration of aluminum, atomic number 13, is [Ne] 3s2 3p1. Aluminum is in Period
The electron configuration of cesium, atomic number 55, is [Xe] 6s1. In what period is cesium?
Because the first energy level contains only the 1s sublevel, the number of elements in this period is
Calcium, atomic number 20, has the electron configuration [Ar] 4s2. In what period is calcium?
Elements to the right side of the periodic table (p-block elements) have properties most associated with
Neutral atoms with an s2p6 electron configuration in the highest energy level belong to which block of the periodic table?
Within the p-block elements, the elements at the top of the table, compared with those at the bottom,
The electron configurations of the noble gases from neon to radon in the periodic table make these elements part of the
The elements whose electron configurations end with s2 p5 in the highest occupied energy level belong to Group
For groups 13 through 18, the total number of electrons in the highest occupied level equals the group number
If n stands for the highest occupied energy level, the outer configuration for all Group 1 elements is
Titanium, atomic number 22, has the configuration [Ar] 3d2 4s2. To what group does titanium belong?
Bromine, atomic number 35, belongs to Group 17. How many electrons does bromine have in its outermost energy level?
Magnesium, atomic number 12, has the electron configuration [Ne] 3s2. To what group does magnesium belong?
The group of soft, silvery, reactive metals, all of which have one electron in an s orbital, is known as the
The first member of the noble gas family, whose highest energy level consists of an octet of electrons, is
When determining the size of an atom by measuring the distance between bonded, identical, adjacent nuclei, the radius of an atom is
A measure of the ability of an atom in a chemical compound to attract electrons from another atom in the compound is called
One-half the distance between the nuclei of identical atoms that are bonded together is called the
The ionization energies for removing successive electrons from sodium are 496 kJ/mol, 4562 kJ/mol, 6912 kJ/mol, and 9544 kJ/mol. The great jump in ionization energy after the first electron is removed indicates that
Which is the best reason that the atomic radius generally increases with atomic number in each group of elements?
The ionization energies required to remove successive electrons from one mole of calcium atoms are 590 kJ/mol, 1145 kJ/mol, 4912 kJ/mol, and 6474 kJ/mol. The most common ion of calcium is probably
Hoe does the energy required to remove an electron from an atom changer as you move left to right in Period 4 from potassium through iron?