Give the names and symbols of the first twenty elements of the periodic table.Differentiate them into metal, nonmetal,metalloids,noble gas
Answers
Answer:Most elements are metals. Examples of metals include iron, tin, sodium, and plutonium. Metals exhibit the following properties:
usually solid at room temperature (mercury is an exception)
high luster (shiny)
metallic appearance
good conductors of heat and electricity
malleable (can be bent and pounded into thin sheets)
ductile (can be drawn into wire)
corrode or oxidize in air and sea water
usually dense (exceptions include lithium, potassium, and sodium)
may have a very high melting point
readily lose electrons
Properties of Metalloids or Semimetals
Examples of metalloids include boron, silicon, and arsenic. Metalloids have some of the properties of metals and some nonmetallic characteristic.
dull or shiny
usually conduct heat and electricity, though not as well as metals
often make good semiconductors
often exist in several forms
often ductile
often malleable
may gain or lose electrons in reactions
Properties of Nonmetals
Nonmetals exhibit very different properties from metals. Examples of nonmetals include oxygen, chlorine, and argon. Nonmetals display some or all of the following characteristics:
dull appearance
usually brittle
poor conductors of heat and electricity
usually less dense, compared to metals
usually low melting point of solids, compared with metals
tend to gain electrons in chemical reactions
The first 20 elements of the periodic table :
1.H —Hydrogen
2.He—Helium
3.Li—Lithium
4.Be—Beryllium
5.B—Boron
6.C—Carbon
7.N—Nitrogen
8.O—Oxygen
9.F—Fluorine
10.Ne—Neon
11.Na—Sodium
12.Mg—Magnesium
13.Al—Aluminum
14.Si—Silicon
15.P—Phosphorus
16.S—Sulfur
17.Cl—Chlorine
18.Ar—Argon
19.K—Potassium
Explanation:
Answer:
1 hydrogen
H
non metal
2 helium
He
non metal
3 lithium
Li
metal
4. beryllium
Be
metal
5 boron
B
metalloids
6 carbon
C
non metal
7 nitrogen
N
non metal
8. oxygen
O
non metal
9 fluorine
F
non metal
10 neon
Ne
noble gas
11 sodium
Na
metal
12 magnesium
Mg
metal
13 aluminium
Al
metal
14 silicon
Si
metalloids
15 phosphorus
P
non metal
16 sulphur
S
non metal
17 chlorine
Cl
non metal
18 Argon
Ar
noble gas
19 potassium
K
metal
20 calcium
Ca
metal