Chemistry

A horizontal row in the periodic table is called a(n)

period

The electron configurations of main-group elements end in....

s and p orbitals

The periodic law states that

the physical and chemical properties of the elements are functions of their atomic numbers

For atoms of p-block elements, the total number of electrons in the highest occupied level is equal to the

Group number minus 10

How did Mendeleev decide which elements should be placed in the same group of the periodic table?

He grouped elements with similar chemical and physical properties

For each successive electron removed from an atom, the ionization energy

increases

The number of valence electrons for group 2 elements is...

2

An element with the general electron configuration ns2np1 for its outermost electrons would be in group...

13

Which ionization energy is generally the largest?

fourth ionization energy

When a carbon is in its ground state, how many electrons does it have in its outermost shell?

4

In forming an ion, from which sublevel would an atom of nickel lose electrons first?

4s

What is the radius, in picometers, of an atom of titanium(atomic number=22)

140pm

The halogens are located in group

17

Compared with the elements at the left end of the p-block element group, the elements at the right end...

Are less metallic

Mosley discovered that elements with similar properties occurred at regular intervals when the elements were arranged in order of increasing

Atomic number

As electrons add to s and p sublevels in the same main energy level, they are pulled closer to the more highly charged nucleus, causing...

Atomic radii to decrease in size

Bromine, which is located in the same period as calcium, has an atomic number that is greater than calcium's. How does the ionization energy of bromine compare with that of calcium?

Bromine has a higher ionization energy than calcium has because, within a period, ionization energy increases as atomic number increases

As the atomic number increases within a group of elements, the atomic radius...

Generally increases

All the alkali metal elements are found on the periodic table on...

Group 1

A measure of the ability of an atom in a chemical compound to attract electrons from another atom in the compound is called...

Electronegativity

Based on the arrangement of elements in the periodic table, what can you predict about the properties of a synthetic element that has an atomic number of 118?

Element number 118 would be a nonmetallic gas whose atoms are unlikely to react with other atoms

Which group number on the modern table includes the noble gases?

Group 8A

A new group was added to mendeleev's periodic table after the discovery of...

Noble gases

The metalliods are located on the periodic table between....

Nonmetals and metals

In which period is an element that has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1 when it is in the ground state?

Period 4

Mendeleev organized the chemical elements based on what?

Properties

Why did the scientists accept the periodic table as a useful way to organize information about the elements?

The table was demonstrated to have predictive value