chem 5

Period 4 contains 18 elements. How many of these elements have electrons in the d sublevel?

16

Bromine, atomic number 35, belongs to Group 17. How many electrons does bromine have in its outermost energy level?

7

what is an ion

An ion is an atom or group of bonded atoms that has a positive charge or negative charge

what is ionization

Any process that results in the form of an ion is referred to as ionization

differences of cation and anion

Cation are smaller and anions are larger than the atoms from which they are formed

The electron configuration of an element is [Kr] 4d6 5s1. To what group does this element belong?

Group 7

what is the group trend of the periodic table

In general, the atomic radii of the main-group elements increase down a group

The electron configuration of cesium, atomic number 55, is [Xe] 6s1. In what period is cesium?

Period 6

anion

a negative ion

cation

a positive ion

what is the group trend for ionization

among the main-group elements, ionization energies generally decrease down the groups

when can an electron be removed from an atom

an electron can be removed from an atom is enough energy is supplied

Within the p-block elements, the elements at the top of the table, compared with those at the bottom,

are less metallic

Mendeleev noticed that properties of elements usually repeated at regular intervals when the elements were arranged in order of increasing

atomic mass.

group trends for electronegativity

electronegativities tend to either decrease down a group or remain the same

period trends for electronegativity

electronegativities tend to increase across each period, although there are exceptions

most electronegative element

fluorine

Magnesium, atomic number 12, has the electron configuration [Ne] 3s2. To what group does magnesium belong?

group 2

Periods with occupied f sublevels

have 32 groups.

what is the trend for ionization trends

in general first ionization energies increase across a period and decrease down a group

electronegativity

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

atomic radius

may be defined as one-half the distance between the nuclei of identical atoms that are bonded together

If n stands for the highest occupied energy level, the outer configuration for all Group 1 elements is

ns1

Calcium, atomic number 20, has the electron configuration [Ar] 4s2. In what period is calcium?

period 4

valence electron

the electrons available to be lost or gained or shared in the formation of chemical compound

electron affinity

the energy change that occurs when an electron is acquired by a neutral atom

what is ionization energy

the energy required to remove one electron from a neutral atom of an element is the ionization energy IE

what is the trend of the periodic table across

the trend to smaller atoms across a period is caused by the increasing positive charge from the nucleus