Periodic Table

The periodic table is the most important chemistry reference there is. It arranges all the knwn elements in an informative array. Elements are arranged left to right and top to bottom in order of icreasing atomic number.

Yes, scientists can identify elements using techniques like spectroscopy, X-ray crystallography, and mass spectrometry. These methods analyze the properties of the elements, such as their light absorption patterns, crystal structure, and mass-to-charge ratios, to determine their identity without relying on the periodic table.

The mass number of an element like calcium is the sum of the number of protons and neutrons in its nucleus. Calcium has 20 protons, so to find the mass number, you would look up the number of neutrons in the periodic table and add that to 20.

The top row of a table is called the header row. It typically contains column labels or headings that describe the data in each column below it.

These elements are (in the Earth crust): Si, Al, O, Ca, Mg, Fe, Na, K, H, C, Ti, P.

No.

In general, metals become more reactive as you move from right to left along a row in the periodic chart. They also are generally more reactive as you move down a column.

Non-metals however are a different story. Non-metals tend to be more reactive as you move from left to right along a row or as you move up a column. Disregarding, of course, the last column of the periodic chart (VIII) as the noble gases are non-reactive (inert).

Atomic number: 33

(Atomic mass: 74.92)

The symbol for Unnilennium is Une. Group Transition Metal, atomic number 109, atomic weight (266). A man-made radioactive transition metal. Discovered by: Heavy Ion Research Laboratory.Year: 1982 Location: Germany.

As you across the Periodic Table from left to right, electronegativity will increase. As you go down a group of the periodic table, electronegativity will decrease. As electronegativty is a particular element's electron attraction, this trend does not apply to noble gases, since they already have a full valence shell of electrons. The simplest way to remember and apply this is just to know that fluorine is the most electronegative element, and then work your way from there. Ex: Since sulfur is closer to fluorine than aluminum, sulfur is more electronegative.

transition metals have electrons in d orbitals that take part in bonding. T

the s and p block elements have no d electrons that take part in bonding, the bonding electrons are all in s and p orbitals.

The period 3 and above s and p block elements do have empty d orbitals that take part in bonding.

A chemical element is a pure chemical substance consisting of one type of atom distinguished by its atomic number, which is the number of protons in its nucleus. Familiar examples of elements include gold, iron, copper, carbon, silicon, mercury, sodium, calcium,hydrogen, nitrogen, chlorine, and neon.

Elements in the first two groups on the right side of the periodic table (Group 13 and Group 14) are typically solid at room temperature, have higher melting and boiling points compared to the alkali metals and alkaline earth metals, and exhibit a combination of metallic and nonmetallic properties. They tend to form covalent compounds and show variable oxidation states.

The two elements along the stair-step line that are not metalloids are aluminum (Al) and tin (Sn). These elements are considered metals based on their properties such as conductivity, luster, and malleability.

Yes, alkali metals are located in the left-most column of the periodic table, specifically in Group 1. They are highly reactive elements with one electron in their outer shell.

Alkali metals get softer down Group 1 due to an increase in atomic size and weaker metallic bonding. As you move down the group, the atomic radius increases, leading to a decrease in the strength of metallic bonding and making the metals softer.

No, it isn't. It is the atomic weight that is a weighted average of the mass of each of the naturally occurring isotopes of an element. The mass number, or A, is the number of protons and neutrons (the so-called nucleons) in the nucleus of an atom of an element. The atomic number, or Z, is the number of protons in the nucleus of an element.

The atomic radius increases down a column in the periodic table because as you move from top to bottom, each element has an additional energy level or shell of electrons. This increase in electron shells results in a larger average distance between the nucleus and the outermost electrons, leading to a larger atomic radius.

Thorium is a member of the actinoids family, period 7 in the periodic table of Mendeleev.

The half life of 232Th is 1,405.1010 years.

Yes, curium is a manmade element produced through nuclear reactions. It was first synthesized in 1944 by researchers at the University of California, Berkeley, as part of the Manhattan Project.

The first attempt at listing elements on the periodic table was made by Dmitri Mendeleev in 1869. He arranged the elements in order of increasing atomic weight and grouped elements with similar properties together. Mendeleev's periodic table laid the foundation for the modern periodic table used today.

Gs stands for Glowstone on the Minecraft Periodic Table of Elements... But on the real Periodic Table, I do not think that "Gs" exists...

Helium (He) is the element that is number 2 on the Periodic Table of Elements. It has an atomic number of 2 and is a noble gas.

Silver (Ag) has 47 protons in its nucleus. Its atomic number is 47, which means is has 47 protons and 47 electrons.