Periodic Table

The size of an atom is bigger than the nucleus because an atom consists of a nucleus surrounded by electron clouds. The electrons are located further away from the nucleus, leading to the overall larger size of the atom.

No, holmium is not considered explosive. It is a rare-earth metal that is primarily used in various industrial applications, such as in lasers and nuclear control rods, but it is not known to be inherently explosive.

The two sets of elements found below the Periodic Table are the Lanthanides and the Actinides, which are also known as the Inner Transition Elements. They are placed separately at the bottom of the Periodic Table to keep the table compact and organized.

Beryllium- 1s2, 2s2 or [He] 2s2

Magnesium- 1s2, 2s2, 2p6, 3s2 or [Ne] 3s2

Calcium- 1s2, 2s2, 2p6, 3s2, 3p6,4s2 or [Ar] 4s2

Strontium- 1s2, 2s2, 2p6,3s2,3p6, 4s2, 3d10, 4p6,5s2 or [Kr] 5s2

Group 7 in the periodic table is also known as the halogens.

The rare earth metals are generally located at the bottom of the periodic table in the rows named the lanthanide or lanthanoid series and the actinide or actinoid series. They are generally said to end the f sublevel although there is much overlap with the d sublevel so it is very inconsistent.

Atomic weight of all elements are relative to oxygen atom being taken as 16. The atomic weight of sodium is 6.940. Sodium metal has a density of 0.59. Density is mass per unit volume. Therefore the atomic volume of sodium is 11.763. Assuming atoms and molecules are spheres, the radius is the cube root of 11.763 divided by (pi x 4/3). But, this is relative oxygen, the radius of which in angstrom units has been determined

The only purpose of knowing the radius of an atom is to calculate its atomic or molecular volume, which, in the case of gases is very nearly the same by calculation but maybe universally equal in fact.

The original determination of the atomic weights of the inert gases was the mass of 22.4 litres of each of them. I, personally, determined the atomic weight of iron accurately to 5 decimal places in the chemistry laboratory of my local university, by chemical means. I could have calculated the atomic volume had that have been required.

A chronological order

Methane

A table pad is a padding you put on your dining table to hold the items on the table to keep them from moving around.The padding is soft on the bottom and ridged on the top to help hold items.

No. "Nuclei" is the plural of "nucleus". In chemistry this usually denotes the atomic nucleus, a tiny but very dense structure of protons and neutrons in the centre of an atom (or ion) that carries most of its mass. The number of protons in the nucleus of any atom indicates the type of chemical element it belongs to, the number of neutrons determines the isotope type.

The reaction between 2AgClO3 and Na2CO3 would produce Ag2CO3 (silver carbonate) and 2NaClO3 (sodium chlorate) as products.

The metals in group 13 would be less reactive than the metals in group 1 because the metals in group 1 are closest to the left of the periodic table. And any thing to the left are more reactive.

The full form of RN in the periodic table stands for Radon. Radon is a colorless, odorless, and tasteless radioactive noble gas. It is found in trace amounts in the atmosphere and is produced as a decay product of uranium and thorium.

The noble gases usually have an octet on the periodic table. They have a full outer shell of electrons, making them stable and unreactive.

The seven horizontal rows of the periodic table are called "periods". They are numbered from 1 to 7, with each period representing the energy level or shell in which the elements in that row have their outermost electrons. As you move from left to right across a period, the number of protons in an element's nucleus increases, resulting in a gradual change in properties.

Neon is a noble gas located in period 2 on the periodic table.

An element should release two of its outermost electrons to obtain +2 ion. The elements in group 2A are the most likely elements to have this configuration. These are known as Alkali Earth Metals.


The elements in the 2nd group have 2 valence electrons. Elements give away their valence electrons to get stable electron configuration. The elements in the 2nd group such as beryllium, magnesium, calcium, strontium, barium likely to have positive ion with charge of 2.

Group II elements (the alkaline earth metals). This is because this particular group of elements have two extra electrons in their electronic configurations. They need to lose these two electrons to attain the stable noble gas configuration. So they will have a tendency to lose them to other atoms or group of atoms, in the process incurring a double positive charge (since there will now be two less electrons than protons). So Be, Mg and Ca will all form positive ions (cations) with a charge of +2. They are represented by Be2+, Mg2+ and Ca2+ respectively. But, other elements like copper and barium will also form cations of charge +2.

The group of elements in the periodic table known as the alkali metals is group 1, which includes lithium, sodium, potassium, rubidium, cesium, and francium. These elements are highly reactive and typically form ionic compounds in reactions.

No, SOCl2 does not contain ionic bonds. It is a covalent compound, meaning the bonding involves the sharing of electrons between the sulfur, oxygen, and chlorine atoms.

Group 1 and Group 2 metals conduct electricity because they have only one or two electrons in their outermost energy level, making it easy for these electrons to move and carry an electric current. The presence of these loosely held electrons allows them to easily flow in response to an electric field.

The order in the first attempt in the periodic table was in the increasing order of atomic weights of atoms. This gave 2 different places for isotopes of the same element with same properties and the same place for isobars with different properties. This was so because chemical properties of an element depends on its number of electrons which is basically given by the atomic number and not atomic weight. Again the lanthanides and actinides had different places inspite of having similar properties due to same atomic number.

Barium is an alkaline earth metal that is very toxic, especially in its soluble forms. Ingesting or inhaling barium compounds can lead to serious health issues such as respiratory problems, muscle weakness, and cardiac irregularities. Barium poisoning can be fatal if not treated promptly.

The elements in the s-block have their last electrons in their electron configuration in the s-orbital.

The number 2 IN FRONT is called a coefficient, and it tells you that there are two water molecules.
The number BETWEEN the "H" and the "O" tells you that in one single molecule of water, it is made of 2 atoms of hydrogen, and 1 atom of oxygen.
For example, if hydrogen gas (H2) is combined oxygen (O2), water (H2O) is formed. Because the formula is H2, two little "2" tells us that hydrogen gas is composed of 2 atoms of hydrogen. Same with oxygen -- O2 is made of two atoms of oxygen. The balanced equation for the reaction to form water is: 2H2 + O2 ---> 2H2O

What the numbers in front of the molecules mean is that 2 molecules of hydrogen combine with one molecule of oxygen to form 2 molecules of water.

See the Related Questions about balanced equations and stoichiometry for more about how coefficients are used and what they tell us about a reaction.