Periodic Table

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Elements with small atomic radii and low ionization energies are more likely to give up electrons rather than share them. These typically include metals such as alkali metals and alkaline earth metals on the left side of the periodic table.

Platinum is a metal. It is a rare and precious metal known for its resistance to corrosion and high value in various industries such as jewelry, electronics, and automotive.

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There are 2 elements in the first period of the periodic table: Hydrogen and Helium.

The atomic number of an elemnt tells you how many protons are in the nucleus and therefore how many electrons thare are in a neutral atom.

The mass number is the toal of protons and neutrons.

HCN stands for hydrogen cyanide, which consists of hydrogen, carbon, and nitrogen atoms. Hydrogen is in the first column (group 1) of the periodic table, carbon is in the fourth column (group 14), and nitrogen is in the fifteenth column (group 15).

There are 6 rare metals they are Helium, Neon, Krypton , Argon, Xenon and radon in the periodic table.

Element 20 on the periodic table is calcium. It is a soft gray alkaline earth metal that is essential for living organisms. Calcium plays a crucial role in various bodily functions, such as bone structure, muscle contraction, and nerve function.

When Mendeleev's periodic table was devised, some elements hadn't been discovered yet. Therefore, there had to be gaps in it or the table would be rendered incorrect.

The rule of similarities states that the elements within a specific period/column are similar in a way and have the same number of electrons in the outer shell. E.g. Period 1 (alkali metals) react strongly with both air and water, have to be stored in oil, and are very alkali, hence the name.

Mendeleev used this rule to construct the periodic table. The amazing thing is, he guessed where elements were missing and left gaps. He even estimated their atomic masses!

In short, Mendeleev's periodic table had some bits missing. (e.g. technetium, discovered in 1936, a whole 65 years after Mendeleev's table was devised in 1871)

P.S. It's Mendeleev, not Mendeelev.

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This is a great question. Actually before 1961 12C had a different mass than it has today. The mass scale we use is actually relative and before 1961 the mass scale was based on Oxygen so 16O = 16 which was the standard in place since 1906. In the 20's people started to discover oxygen isotopes and the chemists 16O scale was not the same as the physicists 16O scale , so it was decided to settle on Carbon to make both the physicists and chemists happy

Check the related link below for the complete history of what happened

The symbol for carbon is C and its atomic number is 6.

Krypton is a component of the Earth atmosphere.

Every type of atom currently know to man. It consists of 118 elements, though the number is always changing.

iradium is the precious metal element apart from platinum

The group of the periodic table that contains the gases is Group 18, also known as the noble gases. These gases include helium, neon, argon, krypton, xenon, and radon, which are all colorless, odorless, and have very low chemical reactivity.

To create a total charge of zero, lithium with an atomic number of 3 (Li) needs to lose one electron to form Li+ with a charge of +1. Fluorine with an atomic number of 9 (F) needs to gain one electron to form F- with a charge of -1. Therefore, one atom of lithium and one atom of fluorine are needed to create a compound with a total charge of zero.

Elements with similar properties are usually located in the same Group (column) on the Periodic Table.

Groups on the periodic table are called families because elements within the same group share similar chemical properties due to having the same number of valence electrons. This similarity in properties is what defines them as a family.

The element with atomic number 119 is a theoretical element and hasn't been observed. However, it does still have an IUPAC systematic placeholder name; which is Ununennium (Uue). Only one attempt has ever been made to make this element. That was in 1985, when Calcium-48 ions were bombarded at Einsteinium-254. It was a failure. If it were to be discovered, it would be the first element of period 8 and would probably fit in under Francium.

A group is a vertical column in the periodic table; there are 8 groups, numbered, always in Roman numerals, I to VII from left to right, with group O (the noble gases) on the far right-hand side. The atoms of elements within any given group have similar outer electron configurations

The elements in each column of the periodic table have generally similar chemical properties, except that in columns 8 through 10, the elements in each row are at least as similar to one another as those in the same columns in other rows.

a soild, melting point 97.72 °C,

room temperature is 20°C

MP > 20 therefore a solid

Hydrogen has properties of both Group 1 and Group 17 elements, making its classification ambiguous. It does not exhibit typical Group 1 characteristics such as similar chemical reactivity to alkali metals or easily losing its electron to form a cation. Additionally, hydrogen forms diatomic molecules in its elemental state, unlike the alkali metals which exist as monatomic species.