Periodic Table

The shell model explains the organization of the periodic table.

The elements in the first period have electrons in the first shell; the elements in the second period have electrons in the first two shells; the elements in the third period have electrons in the first three shells; and so on.

As far as i know, its the atomic mass of oxygen

The glowing gases observed during combustion are the result of light emission produced when the gases are heated to high temperatures. These gases typically include oxygen, nitrogen, and carbon dioxide, which emit different colors of light depending on their composition and the temperature of the flame. The phenomenon is often seen in flames from fuels such as natural gas, wood, or alcohol.

(i) The preparation of sodium carbonate extract affords a convenient method for bringing the anions of the mixture into solution which were otherwise insoluble with caution of salt.

(ii) It removes the basic radical (usually coloured) which interferes in the usual tests of some of the acidic radicals.

(iii) The residue can be used for the tests of basic radicals of I to VI groups. Such a solution does not involve the problem of removing interfering radicals like oxalate, fluoride, borate and phosphate.

The answer is Helium. It has five letters and the second letter is E. Helium is a chemical element with the symbol He and atomic number 2 on the periodic table.

Carbon Dioxide is a compound formed by a Carbon and Oxygen.

Only an element can be classified as a metal, non-metal or a metalloid. Compounds cannot be classified in these categories. Carbon and oxygen both are non-metals.

The iron group refers to Group 8 on the periodic table, which includes iron (Fe), ruthenium (Ru), osmium (Os), and hassium (Hs). The family name for Group 8 is the "iron group" or the "transition metals."

For the elements in all groups, the size of the atom increases down the group. This is because as you descend the group, the number of electrons increases, hence the number of electron shells also increase. For example, the argon atom is bigger than the neon atom because it has one more electron shell (due to 8 more electrons). The extra shell will contribute to a larger atom size.

As you move across a period on the periodic table, the number of protons increases, which increases the atomic number. This results in a greater positive charge in the nucleus, leading to an increase in the attraction between the nucleus and the electrons in the outer energy levels. This trend generally results in smaller atomic size and higher electronegativity as you move across a period.

The three main molecules of life are DNA, RNA, and proteins. DNA carries genetic information, RNA helps in gene expression, and proteins perform a variety of functions in the cell. These molecules are essential for the structure and function of living organisms.

The mass number of magnesium is 24.305 u.

The horizontal scale is called the x-axis. It represents the independent variable in a graph or table, and it runs from left to right. It helps to show the relationship between the data points being plotted.

Eu is the chemical symbol for Europium. Europium is a rare earth element that is commonly used in the production of phosphors for electronic displays, such as those found in TVs and computer monitors.

Neptunium is a member of the actinides group.

As you go down a column on the periodic table, the atomic size increases. This is because each subsequent element in the column has an additional energy level of electrons, leading to increased distance between the nucleus and the outermost electrons, resulting in larger atomic size.

well Scandium has 4s2 and 3d1 outer electrons - all the way up to copper with 4s1 3d10 and Manganese 4s2 3d5 so Scandium is pretty much limited to +3 though other states are rarely possible but Manganese can have +2 with just the s electrons removed all the way to +7 with all removed. There are just more opportunities with transition elements because of the arrangement of bonding electrons and it being energetically feasible to remove them

No, francium bombs have never been made. Francium is a highly radioactive and rare element that is not readily available in large enough quantities to create a bomb. Additionally, the extreme reactivity and short half-life of francium would make it challenging to use in a practical weapon.

Deuterium is heavier than tritium because deuterium is made up of one proton and one neutron, while tritium has one proton and two neutrons. Tritium is lighter because it contains fewer nucleons than deuterium.

An ionic solution is one that contains ions. Te ions are solvated, that is water molecules (if water is the solvent) surround the ions. the bonding is usually electrostatic in origin but some cations (positively charged ions) form stronger bonds with water molecules.

They are called bridge elements because the 'bridge' the first two elements with only one electron shell to the rest of the Periodic Table, which have ascending amounts of electron shells. The first two are also the most abundant elements in the universe.

The atomic weight of protactinium is 231,03588.

Yes, the element neon is named after the Greek word "neos," meaning new. This name was chosen because neon was a newly discovered element at the time of its naming.

Titanium is the metal that has a low density and is sufficiently strong, making it ideal for use in airplanes and aerospace vehicles. It offers a high strength-to-weight ratio, making it lighter than steel but still able to withstand high stress and temperature conditions.

Most man-made elements appear in the lower rows of the periodic table, specifically in the transuranium (after uranium) region. These elements have atomic numbers higher than 92 and are typically synthesized in laboratories using particle accelerators or nuclear reactors.

heck yeah it is so radioactive I almost pooped my pants