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Question 1

Who is the first to make periodic table

Answer 1

Dmitri Meendleev

Question 2

What are isotopes?

Answer 2

Variant of an element with same number of protons but different number of neutrons.

Question 3

What are three main constituents of an atom

Answer 3

protons, neutrons, electrons

Question 4

what number group are nobel gases in, how many electrons do they have

Answer 4

Noble gases are in group eight and eighteen because its stable

Question 5

The number of protons and neutrons fluorine are presented as 9F19are ________ and________ respectively

Answer 5

protons are 9 and neutrons are 10

Question 6

What is a valence electron

Answer 6

The electron in the outer most orbit of an atom

Question 7

1.What is atomic number and atomic weight?
2. How to calculate number of protons, neutrons and electrons present in a given element?Smaller and larger numbers are atomic number and atomic weight (or atomic mass) respectively

Answer 7

the atomic number is the number of protons in an atom’s nucleus and it identifies the element.

For example, carbon has an atomic number of 6, meaning it has 6 protons.

Question 7

How many valence electrons are in elements of the group IIIA?

Answer 7

THREE electrons. VA elements will contain five electrons in its outer most orbit

Question 8

What is a period,and what is a group?

Answer 8

Horizontal lines resemble periods and VG is vertical lines are group

Question 9

How many periods are present in the periodic table

Answer 9

seven

Question 10

How many groups “A” are present in the periodic table

Answer 10

eight

Question 11

Know properties of metals, semimetal/metalloid/semiconductor ,and non-metal.

Answer 11

Metals, Conductivity: Good conductors of heat and electricity.State: Mostly solid at room temperature

Metalloid, Conductivity: Intermediate; can conduct electricity but not as well as metals
State: Solid at room temperature

Non-Metals, Conductivity: Poor conductors of heat and electricity.
Physical Properties: Brittle if solid, not shiny. State: Can be gases, liquids, or solids at room temperature.

Question 12

what are group I elements called

Answer 12

Group I elements are called alkaline metal except hydrogen.

Question 12

How many total groups are present in the periodic table

Answer 12

eighteen

Question 13

Which is the only element that can be burnt in nitrogen?

Answer 13

titanium

Question 14

how is sodium chloride formed

Answer 14

Sodium chloride (NaCl)is formed by reacting sodium and chlorin

Question 14

what are IIA elements

Answer 14

IIA elements are alkaline earth metals. They are harder/denser/ have higher meltingpoints than alkali metal.

Question 15

some transition metaals

Answer 15

Transition metals: Examples are silver (Ag), copper (Cu), gold (Au), Zinc (Zn).

Question 15

what is mercury? bromine? and galliumis?

Answer 15

Mercury is the only metal that is liquid. It is also a poison to inhale. Bromine is also liquid at room temperature and is non-metalin nature. Galliumis anothermetal with its melting point close to room temperature (85.6 oF)

Question 16

Fe (iron) is main constituent in hemoglobin for O2(oxygen) transport in humans,mammals and other vertebrates. Red color of the blood comes from Heme protein whichcontains Fe;Without iron, we won’t survive;

Question 17

what type of gases can be found in the atmosphere

Answer 17

Most of the gases found in atmosphere are non-metals. Examples are O2, N2. P

Question 17

2 Rare Earth metal

Answer 17

lanthanides and actinide

Question 18

are Actinides are radioactiv (T or F)

Answer 18

True

Question 19

do Non-metals have a heat conductor of heat/electricity (yes or No)

Answer 19

No

Question 19

Which group do halogens belong to?

Answer 19

Answer is group 7A.Halogens are most reactive of allnon-metals

Question 20

what are halogens used in?

Answer 20

Halogens are used in light bulbs. because it increases lifetime

Question 21

what is si an example of

Answer 21

Si is an example of metalloid/semiconductor/semimetal;

Question 22

how do you make silicon chips? where does it come from?

Answer 22

Si needs to be doped with impurities to make silicon chips. Doping makes Si more conducting. Si comes from Sand

Question 23

About 91 elements of more than 118 elements exist naturally, the rest do not existnaturally or they live for a very short period of time (usually in nuclear reactions

Question 24

What is the most abundant element in the universe?

Answer 24

Hydrogen ~75% of the universe’s total mass

Question 24

what happens when you mix hydrogen and oxygen

Answer 24

When hydrogen and oxygen are mixed together it produces an explosion. In fact, this combination is used as rocket fuel.

Question 25

zirconium

Answer 25

Zirconium is used to coat the outside of the shuttle because it can withstand very hightemperature, and it protects the shuttle from burning up when it reenters theatmosphere at a velocity more than 1800 miles per hour;

Question 26

Different elements produce different colors of flames when they are ignited

Question 26

tungsten

Answer 26

Tungsten has the highest melting point of all the elements.

Question 26

diamond

Answer 26

Diamond is the hardest substance found in nature, but it doesn’t last forever. In fact,in several million years it will convert to graphite (constituent of lead pencils). So, you may want to think of a getting a graphite ring instead of a diamond ring

Question 27

Allotropes are the different form of an element: diamond, graphite, bucky ball, and carbonnanotubes are allotropes of carbon. Diamond, graphite, bucky ball (C60), and carbon nanotubes contain only carbon atoms but they are arranged in different manner leading to very different properties. Diamond being the hardest natural occurring material whereas graphite is very soft and used as a solid lubrican

Question 28

How are metals different from non-metals and metalloids?

Answer 28

metals conduct heat and electricity, non metals no heat, metalloids no heat

Question 29

Group zero or eight are noble gases