Periodic Table of Elements Questions

The Mendeleev and Moseley periodic charts had gaps for undiscovered elements. Why do you think the chart used by Moseley was more accurate at predicting where new elements would be placed?

Which types of elements are most likely to form complex ions with water?

How many neutrons does lead-207 have?

A certain atom has 26 protons, 26 electrons, and 30 neutrons. Its mass number is

What largely determines the chemical reactivity and properties of an element?

How many outermost electrons do lithium and potassium have?Multiple choice question.

A friend says, "I know how many electrons the atom has, and I know how many protons it has, but I don't know whether or not it is neutral." How would you respond?

Use the periodic table to find the name, atomic number, atomic mass, and the number of outermost electrons for each of the following elements: N, P, As, and Sb.

Who produced the first Periodic Table of Elements? How were elements organized in this table?

Complete the following table. find atomic mass atomic number, number of protons, number of neutrons

As you move from left to right in a row of the periodic table, metallic properties increase.

Fill in the blank question.Suppose that you have just discovered a new element and have named it "neptunite." While studying your new element you find that it has two isotopes that are present in equal amounts in nature. These are neptunite-220 and neptunite-250. What is the average atomic mass of your new element?

Quarks can be produced by bombarding protons with protons.

The element nickel has five naturally occurring isotopes. Which of the following describes the relationship of these isotopes?

Which of the following is the correct chemical symbol for carbon?

The illustration shows the upper right section of the periodic table. Which section of the table represents the metalloids?

Which group of elements on the periodic table is unreactive?

In which of the following states is nitrogen found at room temperature?

Elements that are in the same have the same number of electrons in their outer . These outer electrons are so important in determining the chemical of an element that a special way to represent them has been developed. A(n) uses the symbol of the element and dots to represent the electrons in the outer

How can atoms have an atomic number of 20 and a mass number of 40 but others have a mass number of 47