Job Roles

In chemistry, the term transition metal has three possible meanings: The IUPAC definition defines a transition metal as "an element whose atom has a partially filled d sub-shell, or which can give rise to cations with an incomplete d sub-shell".

Any of the set of metallic elements occupying a central block (Groups IVB–VIII, IB, and IIB, or 4–12) in the periodic table, e.g. iron, manganese, chromium, and copper. Chemically they show variable valency and a strong tendency to form coordination compounds, and many of their compounds are coloured.

Here in the given options, only iron (Fe) is a transition metal since Strontium is an alkaline earth, arsenic is a metalloid, hydrogen is (normally) a diatomic gas.

The phalanges or a phalanx are/is digital bones in the hands and feet of most vertebrates. In primates, the thumbs and big toes have two phalanges while the other digits have three phalanges. The phalanges are classed as long bones.

Here I give you the first 30 Atomic elements names and their Atomic masses.

Atomic number      Element        Atomic mass
                             

        1                 Hydrogen           1

        2                  Helium              4

        3                 Lithium              6.94

        4                Beryllium            9.01

        5                  Boron               10.81

        6                Carbon               12.01

        7                Nitrogen             14.01

        8                Oxygen              15.99

        9                Fluorine              19.00

       10                Neon                 20.18

       11               Sodium               22.99

       12             Magnesium           25.31

       13             Aluminium            26.98

       14               Silicon                28.09

       15             Phosphorus           30.97

       16               Sulphur               32.07

       17               Chlorine              35.45

       18                Argon                 39.95

       19             Potassium              39.10

       20              Calcium                40.08

       21             Scandium              44.96

       22             Titanium               47.87

       23            Vanadium              50.94

       24             Chromium            24. 52

       25            Manganese            54.94

       26                Iron                  55.85

       27              Cobalt                 58.93

       28               Nickel                 58.69

       29              Copper                 63.55

       30                Zinc                   65.41

Gum.

The term facultative anaerobe refers to an organism that which uses oxygen when it is present or grows without oxygen when it is not there.

Intersection method of expressing direction is indicated in the illustration.

A production–possibility frontier (PPF) or production possibility curve (PPC) is the possible tradeoff of producing combinations of goods with constant technology and resources per unit time.

Latitude comes first among latitude or longitude. 

Latitude is written before longitude. The first number is always the latitude and the second is the longitude.

Latitude is written with a number, followed by either “north” or “south” depending on whether it is located north or south of the equator. Longitude is written with a number, followed by either “east” or “west” depending on whether it is located east or west of the Prime Meridian.