Periodic Table

The combining ratio between elements in group 2 (alkaline earth metals) and elements in group 15 (nitrogen family) is typically 3:2. For example, magnesium oxide (MgO) forms when one atom of magnesium (group 2) combines with one atom of oxygen (group 16), resulting in a 1:1 ratio.

Alkali metals are known for there ability to destroy blood plankta inside your blood stream (been 3 recorded deaths so far). Also transition metals are known for there low electronegativity and there ability to produce amphiprotic substances. Just so many awesome reasons why you cant pass transition metals.

The number of electrons that can be accommodated in an "N" shell is given by the formula 2n^2, where "n" is the principal quantum number of the shell. For example, in the third shell (n=3), the number of electrons that can be accommodated is 2(3)^2 = 18 electrons.

Periodicity on the periodic table refers to the repeating pattern of physical and chemical properties of elements as you move across or down the table. This periodic pattern is a result of the elements having similar outer electron configurations within the same group or period. Periodicity helps to predict an element's properties based on its position in the periodic table.

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Periods are arranged horizontally on the periodic table based on the number of energy levels in an atom, while groups are arranged vertically based on the similar chemical properties of elements. Periods indicate the number of electron shells an element has, while groups indicate the number of valence electrons an element has, which influences its reactivity.

The noble gases, such as helium, neon, and argon, were difficult for Mendeleev to add to his table as they were found to be chemically inert and did not easily combine with other elements in fixed ratios. This challenged the periodicity of his table, which was based on the repeating patterns of chemical properties.

The elements in Figure 6-2 can be identified as metals or nonmetals based on their location within the periodic table. Metals are typically found on the left side of the periodic table, while nonmetals are located on the right. Review the figure and classify each element accordingly.

No, lead is heavier than platinum. Lead has a higher density and atomic weight compared to platinum.

There are three types of hydride: saline, metallic and covalent (there are alternative names for the types of hydride, but these are most common).

Saline hydrides have crystalline, salt like structures, and are formed with hydrogen and the group 1 and group 2 metals (the alkali metals and the alkaline earth metals).

Metallic hydrides are brittle solids with fairly simple structures, generally formed between hydrogen and the transition metals. They can often have non-integer stoichiometries, e.g. ZrH1.3.

Covalent hydrides are formed between hydrogen and the p-block elements, and tend to be gases as room temperature (there are exceptions to this, because of hydrogen bonding).

Water is called the Mickey Mouse Molecule because water molecules look like Mickey Mouse's head when they are enlarged. The two hydrogen atoms form the "ears", and the oxygen atom forms the "head."

The chemical symbol for copper is "Cu" and its atomic number is 29.

The heaviest element in group 16 is Polonium. It has an atomic number of 84 and is a rare, highly radioactive metal.

The atomic number of an element is given based on the number of protons in the nucleus of all the atoms of that particular element. This applies regardless of the number of neutrons or electrons in any atom of that element. Atoms are initially classified according to the number of protons in the nucleus of an atom, and this will identify which element the atom is.

We know that the number of neutrons a given atom of any element can vary, and these will be classified as isotopes of that element. We also know that the number of electrons in any atom will vary, too. Atoms with a neutral charge will have the same number of electrons as protons, but the number of electrons can vary for a number of reasons. The number of protons, however will allow an investigator to identify an atom as being a particular element, and the atom will be further classified from there according to the number of neutrons and/or electrons it has.

In sequence, the four steps typically followed to create a structure chart are ____.

Answer

review the DFDs; identify modules and relationships; add couples, loops, and conditions; analyze the structure chart and the data dictionary

identify modules and relationships; add couples, loops, and conditions; analyze the structure chart and the data dictionary; review the DFDs

add couples, loops, and conditions; analyze the structure chart and the data dictionary; review the DFDs; identify modules and relationships

analyze the structure chart and the data dictionary; review the DFDs; identify modules and relationships; add couples, loops, and condition

If you mix pure sodium with water, it will explode into flames. This doesn't happen in the ocean because it is a mixture of water (H2O) and salt (NaCl).

If you digest too much sodium, you can die of a very severe skin rash.

Did you know that every year people consume 100,000,000 tons of sodium compounds?

Elements by definition are electrical neutral and therefore are not cations, which have a positive electrical charge. The first (i.e., those having the lowest atomic numbers) 20 elements that commonly form cations during chemical reaction are hydrogen, lithium, beryllium, sodium, magnesium, aluminum, potassium, calcium, scandium, titanium, vanadium, chromium, manganese, iron, cobalt, nickel, copper, zinc, gallium, and arsenic.

A substance appears colored because it absorbs light at specific wavelengths in the visible part of the electromagnetic spectrum and transmits or reflects the rest of wavelength. Each wavelength of visible light represents a different color.

Most of the compounds if transition metals are colored in the solid or solution state. This is due the fact that the transition metal ions in them are colored. coloration of metal ions arises from the excitation of electrons from the d-orbitals of lower energy to d-orbitals of higher energy.The energy required for d-d electron excitation is available in the visible range. it is for this reason that transition metal ions have the property to absorb certain radiations from visible region and exhibit he complementary color.

Transition metal ions having completely filled or empty d-orbitals are colorless. In both cases excitation of electrons to higher orbitals is not possible.

for further info read about atomic structure, spectrum and colors.

The elements in the periodic table are arranged by increasing atomic number, which is the number of protons in the nucleus of an atom. This arrangement helps group elements with similar properties into columns called groups or families, and elements with the same number of electron shells into rows called periods.

It has a very metallic silvery-white appearance. It is brittle & unreactive with water and sum acids. It has side affects to humans...It gives them major garlic breath and body odor. It is grown in crystalline form. Its conductivity increases slightly with exposure to light. it is used to color class and blasting caps. It has a semiconductor and is freqently droped with copper,tin,gold or silver. Tellurium will burn with oxygen to create a green-blue flame It was discovered by Franz Muller Von Reichenstein in 1782. tellurium is extremely rare. atomic # is 52

atomis mass is 128 # of protons is 26

# of neutrons is 76

# of electrons is 26 melting point-450 c.

Boiling point-1390 c.

normal phase-solid classsification-metalloid

and

part of the oxygen family. Came from the latin word for earth (teelus)

Tellurium is quite expensive: $100 per lb at 99.5% purity.