topic three/thirteen

Question 1

what is nuclear charge the same as

Answer 1

atomic number

Question 2

what does the period number tell us

Answer 2

gives the number of occupied main energy levels in the atom

Question 3

what does the group number tell us

Answer 3

number of valence electrons

Question 4

metals are mainly located wehre on the periodic table

Answer 4

s block, d block, f block

Question 5

characteristic properties of alkali metals

Answer 5

The most reactive group of metals – react strongly with cold water.

Question 6

characteristic properties of alkaline earth metals

Answer 6

Reactive metals – but less reactive than group 1.

Question 7

characteristic properties of the halogens

Answer 7

The most reactive group of non-metals.

Question 8

characteristic properties of the noble gases

Answer 8

A group of very unreactive monatomic gases.

Question 9

characteristic properties of the transition metals

Answer 9

Relatively stable metals with only moderate reactivity – useful for construction.

Question 10

what are lanthanides and actinides

Answer 10

metallic elements that make up the f block

Question 11

s block

Answer 11

groups 1 and 2

Question 12

d block

Answer 12

groups 3 to 12

Question 13

p block

Answer 13

13 to 18

Question 14

f block

Answer 14

bottom of the periodic table

Question 15

what does the block of an element tell us

Answer 15

which sub level is in the process of being filled

Question 16

which block are hydrogen and helium

Answer 16

s block although often placed above group 1

Question 17

what is a transition element

Answer 17

defined as an element that has an incomplete d sub-level in its atom or one or more of its ions.

Question 18

properties of transition elements

Answer 18

They have variable oxidation states.
They form coloured compounds.
The elements or their compounds show catalytic activity.
They form complex ions in solution.
The metals and their complexes show magnetic properties.

Question 19

why is scandium the only element that cant have a +2 oxidation state

Answer 19

ha sonly one unparied d electron

Question 20

what is the reason for these variable oxidation states is

Answer 20

the closeness in energy of the 3d and 4s sub-levels.

Question 21

what is an ionic bond

Answer 21

an electrostatic attraction between oppositely-charged ions. Ionic bonds are formed by elements with an electronegativity difference of approximately 1.8 units and greater.