An atom contains protons, neutrons and electrons; the protons and neutrons are I the nucleus of the atoms and the electrons are in the outer shells of the atoms. There are different charges of protons, neutron’s and electron’s: protons have a positive charge however, neutron have no charges and electrons have a negative charge. The electron shells contain electrons a 8 electrons can make a full outer shell however, the first shell has to always be 2 electrons in it In addition the periodic table is table that represents elements as symbols e.g. (He) represents helium, each symbol have a number above the symbols and one at the bottom of the symbols The number at the top represents the relative atomic mass (protons plus neutrons) there is …show more content…
As you go down the column an atomic orbital adds on. Similarities can be elements in group 1 have all got low melting point and they are all soft and weak alkali metals. Each group number represents the number of electrons in the outermost shell in every element in the group. Blocks Blocks that separate elements (S, P, D and F block), the s block contains the elements which are on the left side, the elements consist of alkali metals and alkaline earth elements. In addition is d block contains the transition metals which are in the middle of the periodic table correspondingly, the p block contains the noble gases such hydrogen the p block also contains halogens and metalloid’s these are on the right side of the periodic table. The F block contains radioactive elements. Trends in chemical and physical properties in the groups and periods they belong to I am going to explain the trends of chemical and physical properties by giving examples from group 1 and 7 elements, group 1 elements have similar properties as they are alkali metals and as you go down the group the elements get more reactive e.g. lithium is more harder and less reactive than the element at the bottom of the group which is the most reactive and very soft, also the melting points and The alkali metals generally become more dense going down the group and they become softer, but the trend is not perfect because potassium is less dense than sodium. All of the outer most shells in group 1
For the lesson observed the objectives was to explain the trends of the periodic table based on the elements’ valence electrons and atomic numbers. Additionally, students were responsible for applying their previous knowledge in calculating subatomic particles to review the Bohr Models and discus the relationship among families in the periodic table. Students will use the information from today’s lesson to make future judgments on reactivity and bonding created during chemical reactions in the next unit. Lastly, students were to connect the information on elemental properties to previous experiences with their health, commercial products, and everyday life.
The elements were organized by Dimitri Mendeleév. He organized them by properties (columns), groups (horizontal), and atomic number (the number of protons and electrons). This became known as the Periodic Table. And currently there are 118 elements. He also found gaps in which elements that were yet to be discovered were to go, three of these unknown elements were found and identified in Mendeleév's lifetime. The elements today are used in everything and 75% of the 118 elements are metal.
The identity of each element is defined by the number of protons in its nucleus
We can use the small numbers to give information about the particles in the nucleus.
6. The mass number is equal to an atom’s number of protons and neutrons added together.
-Henry Gwyn Jeffreys Moseley- Worked with Ernest Rutherford, experimented with 38 metals, he found that the positive charge of each element’s nucleus increased by one from element to element as they were arranged in Mendeleev’s periodic table, lead to modern definition of atomic number (# of protons in atom’s nucleus) and the recognition the
I can use these three values to characterize the structure, charge, and the mass of an atom by using the knowledge I know already. In the problem this atom has 3 protons so its atomic number will be 3 and its mass number equal the number of protons plus number of neutrons equal which you can write like this 3 + 4. The problem 3 + 4 will equal 7. This atom also has 3 electrons, balancing the charge of 3 protons that exist in its nucleus, concluding that this atom has an atomic number of 3 and a mass number 7. The element is
The element I’m doing research on is Neon. Neon is usually used for advertising. For example, the Las Vegas sign uses neon so it can have a bright light or shine in the dark. The element’s chemical symbol on the periodic table is ‘Ne.’ It’s really easy to spot the symbol on the periodic table since it uses the first two letters in the actual word, Neon. The atomic number is shown above the element’s symbol on the periodic table. The number represents how many protons and neutrons it has. In this element, the number is 10, which means there’s 10 protons and neutrons. The atomic mass tells us the mass of the atom, for neon the mass is 20.180. In the periodic table, the mass is usually located underneath the chemical symbol. For each atom, every
The five elements will be explained in the following
In this lab, students compared the periodic trends of the elements in comparison to the atomic number. A periodic trend is the tendency of certain properties of the elements to increase or decrease as one progresses along a row or column of the periodic table. The periodic table is arranged in such a way that these trends are easy to compare, which is the purpose of this lab. One trend, for example, is between the electronegativity and the atomic number on an element, another being the density. When comparing the trends, notice that electronegativity decreases when going down the groups, or columns, of the period table, whereas the density increases.
The periodic table tells us what the atomic mass of an atom is. The periodic table is shaped the way it is because of its properties of the elements. Mendeleev predicted what the properties were, whereas, we saw the changes and grouped by that. (What is the Periodic
The periodic table is a table that categorises and displays all of the chemical elements. It is made up of groups, periods and blocks. A group (also referred to as a family) are the columns of elements, there are 8 groups. The elements in each family have similar but not identical properties and they all have the same number of outer electrons. E.g. lithium (Li), sodium (Na), potassium (K) are all soft, white, shiny metals because they are all members of group 1. A period is each horizontal row of elements, there are 7 periods. In a period, the elements are not alike in properties, the first element in a period is always an extremely active solid, and the last element in a period is always an inactive gas. Properties change greatly across a given row. Each new period represents the next shell which electrons fill. A block is a region of the periodic, there are 4 blocks: S, D, P and F.
For the Average Atomic Mass worksheet, the objective is to find the average atomic mass by using a specific formula. There is also problems on the back of the worksheet which are problems on isotopes. For the review packet, there are nine different worksheets that practice on a lot of different things like density calculations, physical and chemical changes, and the scientific method.
For each element, we believe that its mass and atomic number have a positive linear relationship. We can expect that as the atomic mass increases, the mass of the gas will increase as well.
1. Write the complete symbol and determine the no. of electrons, protons and neutrons of the following