Periodic Table

We can not answer your question because you have not made it clear what chapter 18 is part of. Please take the time to make sure your questions are complete and answerable, don't just copy them off your exercise book.

The element gold (Au) has been known since ancient times and does not have a single credited discoverer. Its use dates back to ancient civilizations like the Egyptians and Mesopotamians. Gold is a well-known metal due to its distinctive properties and appearance.

A polar covalent bond is present in HCl. This occurs due to the difference in electronegativity values between hydrogen (2.20) and chlorine (3.16) according to the periodic table link provided. The greater electronegativity of chlorine results in unequal sharing of electrons, creating a partial positive charge on hydrogen and a partial negative charge on chlorine.

1--Luster (shiny-ness)

2--Melting point is above room temperature (~20 degrees C) except for Mercury (Hg)

Others

-Malleability - can withstand higher amounts of stress than other solid non-metals (ex: gold can be pounded into thin sheets without breaking)

-Good conductors of heat and electricity

On the periodic table group 4A is carbon, silicon, germanium, tin and lead. (aka "The Carbon Group")

A chemical change is a process in which one or more substances are transformed into new substances with different chemical properties. This usually involves the breaking and forming of chemical bonds between atoms. Some common indicators of a chemical change include the production of heat or light, color change, gas formation, or the formation of a precipitate.

Noble gases rarely form chemical bonds due to their stable electron configuration (full valence shell). This stability makes them unreactive and less likely to participate in bonding with other elements.

Jazz, who was a member of Dru Hill, was the heaviest member of the group.

The periodic table can be used to describe atomic structure by using the period to tell you how many shells (principle quantum number) there are in an element, and the group number can be used to tell you the number of valence electrons in the outermost shell.

Idk

Becuase the table goes in order. starting with hydrogen wiht 1 proton. then it goes higher and higher to something like 112 protons and 165 neutrons, but we havent found out what has 113 protons and 171 neutrons, but we do know the element that has lets say, 119 protons and x amount of neutrons. that's why t here are spaces.

Electron configuration is the arrangement of elements according to their increasing atomic numbers whiles period is the arrangement of elements according to the increasing number of valence electrons.

No.

Lithium and sodium are both from the same column of the periodic table and so have similar chemical properties. Lithium is atomic number 3 with a weight of 6.94. Sodium is much bigger and heavier with an atomic number of 11 and a weight of 22.99.

The most active nonmetal element is fluorine.

Nitrogen belongs to Group 15 (formerly known as Group VA) of the periodic table, also called the pnictogens. Nitrogen is a nonmetal and is the most abundant element in Earth's atmosphere, making up about 78% of the air we breathe.

"La" in the periodic table stands for the element Lanthanum, which is a rare earth metal. It has an atomic number of 57 and is commonly used in the production of camera lenses, catalysts, and high-strength steel alloys.

In its normal state, beryllium is a grayish-white metal that is light in weight and has a relatively high melting point. It has a shiny surface and is brittle in nature.

Lithium is the most reactive, followed by nickel, and then xenon. Lithium is a very reactive alkali metal, while nickel is a transition metal with moderate reactivity. Xenon is a noble gas and is generally unreactive due to its stable electron configuration.

The atomic number is equal to the number of protons. So the atomic number is 16.

economic depression known as the Great Depression, characterized by widespread unemployment, bank failures, and severe economic hardship. This period was marked by a significant decline in global economic activity.

A Group 6A element gains two electrons

A Group 2A element loses two electrons

A Group 3A element loses three electrons

A Group 3A element loses three electrons

group 1a element loses one electron

group 7a gains one electron

The modern periodic table has the most non-metals in periods 2, 3, and 6. These periods contain a larger number of elements that exhibit non-metal properties such as poor conductivity, low melting points, and brittle structures.

The hundredth element on the periodic table is fermium, with the symbol Fm and atomic number 100. It is a synthetic element that is radioactive and typically produced in nuclear reactors.

Chlorine belongs to group 17 of period 3.It belongs to Halogens group with atomic number 17.

The effective nuclear charge increases when moving down the first group due to the increase in the number of electron shells or energy levels. While the number of protons in the nucleus also increases, the shielding effect from inner electron shells is not sufficient to counterbalance the increased positive charge from the nucleus, resulting in a stronger attraction for the outer electrons.