Periodic Table

Elements in groups 1 to 7 of the periodic table are:

• Group 1: Alkali metals, such as lithium, sodium, and potassium.
• Group 2: Alkaline earth metals, such as beryllium, magnesium, and calcium.
• Group 3-12: Transition metals, like iron, copper, and zinc.
• Group 13-17: Nonmetals and metalloids, including boron, carbon, nitrogen, oxygen, and fluorine.
• Group 18: Noble gases, like helium, neon, and argon.

Most, 99.91%, of the lanthanum found in nature is 139La, which is not radioactive. The other 0.09% is made up of 138La, which is radioactive but has a very long half life of 105,000,000,000 years. Like all elements, lanthanum has synthetic radioactive isotopes.

As you move from left to right across the periodic table in the same energy level, the effective nuclear charge (the net positive charge experienced by valence electrons) increases. This increased nuclear charge pulls the electrons closer to the nucleus, resulting in a smaller atomic radius. Additionally, the increase in the number of protons in the nucleus also contributes to the stronger attraction on the electrons, leading to a decreased atomic size.

No, Cu is not an alkali metal. It is a transition metal. Alkali metals are found in Group 1 of the periodic table, while copper (Cu) is located in Group 11.

Tungsten has a smooth, metallic texture.

An element with an atomic number greater than 92 is considered a transuranium element. These elements are artificially created in a laboratory and are generally unstable, undergoing radioactive decay. Examples include neptunium, plutonium, and americium.

It would be invented some time later in the future. It's like PJ sandwich's, sooner or later someone will find out peanut butter and jam on bread go great together also like chocolate and peanut butter

The chemical compound H2SO4 is not on the Periodic Table as it is a compound not an element. However, it is made up of three elements: Hydrogen, Sulphur and Oxygen. In one molecule of this compound there are 7 atoms: 2 Hydrogen atoms, 1 Sulphur atom and 4 Oxygen atoms. The common name for H2SO4 is Sulphuric Acid.

noble gases, or inert gases

they are the same thing and they are group 18

they have full valence electrons so they are unlikely to react with other elements

The two types of current flow in a semiconductor are electron current, which is due to the movement of negatively charged electrons, and hole current, which is due to the movement of positively charged "holes" left behind when electrons move through the crystal lattice.

This periodic pattern is known as the periodic table. It allows us to predict the properties of elements based on their position in the table. The arrangement is based on the number of protons in the nucleus of each element, which determines its chemical behavior.

A glass of saltwater, a solution of sugar in water, and air are examples of homogeneous mixtures. In each case, the components are evenly distributed throughout the mixture at a molecular level, resulting in a uniform appearance and properties.

Silicon, silicium, Si, is number 14 in the periodic table.

Down a group, the number of shells increases, also the atomic size. Thus , the metallic character increase does increase as going DOWN a group. It is easy to remove an electron froman atom of bigger size.

Not families, Periods (Apex)

The elements are all organized according to atomic number from smallest to largest and placed in rows and columns based upon their size, number of electrons in the outer shell and common characteristics.

Potassium is a metal that oxidizes quickly. Because of this, once it is exposed to air, its shine becomes dull quickly.

In the periodic table, the atomic size increases with every period due to addition of an extra shell.

The atomic size decreases with every group since no. of electrons and protons are increased with every group across a period leading to extra electrostatic force

of attraction between electrons and the nucleus and thus shrinking the size of the atom.

The equation for a complete combustion reaction of CH4 is :

CH4 + 2 O2 = CO2 + 2 H2O, showing that one mole of carbon dioxide is formed for each mole of CH4 burned. Therefore, the answer is 44 moles of CO2 formed.

The atomic volume of nickel is approximately 6.59 cubic centimeters per mole.

The alkali metals in group one are called unipositive because each atom allows one electron to move freely through out the bulk of the metal. This is know as the electronic sea. Group two atoms allow two electrons to move freely. The more electrons of each atom that is available for bonding the harder and more dense the structure.

The element that has the lowest boiling point (turns into a gas at the lowest temperature) is Helium (He). Helium, depending on the isotope, turns into a gas at either 4.2K or 3.2K. This is -268.8 and -269.8 celcius respectively.

In theory, an element is made up of just one kind of atom and a compound is made up of two or more different elements that have formed a chemical bond. Empirically, there are lots of tests and measurements that you can make, as a chemist, to investigate the nature of any given substance. It's really too complex a subject to present fully in this answer.

It's a liquid at room temperature, it is a nonmetal.

If X is an element from group 1 (alkali metals), the formula of its oxide would be X2O. Alkali metals have a +1 oxidation state, which combines with the -2 oxidation state of oxygen to form a neutral compound.