a substance that cannot be broken down into a simpler substance by ordinary chemical means
the smallest unit of an element that has all of the properties of the element; basic building block of matter.
the number of protons and neutrons in the nucleus of one atom of the element.
the number of protons contained in each nucleus of its atoms of the element.
a horizontal row (left to right) in the periodic table.
a vertical column (up and down) on the periodic table.
a chart that organizes information about all of the known elements according to their atomic number.
describes how likely an element is to form bonds with other elements.
an element or substance that conducts heat and electricity, is malleable and ductile and has low ionization energy and low electronegativity values. Metals
an element that does not conduct electricity or heat and is usually a gas at room temperature. Nonmetals are brittle, have high ionization energies and high electronegativity values. Nonmetals tend to gain electrons to form anions
group 1 metals on the periodic table that contain 1 valence electron and lose their valence electrons the most easily, making them the most reactive metals.
group 1 metals on the periodic table that contain 2 valence electrons and are the second most reactive metals.
group 3-12 on the periodic table. They have varying valence electrons and do not follow the normal trends of the other metals. They form brightly colored compounds and ions in solution.
group 17 nonmetals on the periodic table that contain 7 valence electrons. They only need to gain 1 valence electron to have a stable octet. They gain valence electrons the most readily, making them the most reactive nonmetals.
group 18 elements on the periodic table that contain 8 valence electrons (He has 2) and a full valence shell making them very stable and inert.
an element that has some properties of a metal and some properties of a nonmetal. The metalloids are found on the boron staircase, there are 7 metalloids: B, Si, Ge, As, Sb, Te, and Po.
elements and/or compounds that when put together are unable to react chemically. The noble gases (group 18) elements are inert because of a full valence shell.
the charge of an atoms nucleus resulting from its number of protons
the distance between the nucleus of an atom and it's outermost energy level
the attraction a nucleus has resulting from its number of protons
Crossword puzzles have been published in newspapers and other publications since 1873. They consist of a grid of squares where the player aims to write words both horizontally and vertically.
Next to the crossword will be a series of questions or clues, which relate to the various rows or lines of boxes in the crossword. The player reads the question or clue, and tries to find a word that answers the question in the same amount of letters as there are boxes in the related crossword row or line.
Some of the words will share letters, so will need to match up with each other. The words can vary in length and complexity, as can the clues.
The fantastic thing about crosswords is, they are completely flexible for whatever age or reading level you need. You can use many words to create a complex crossword for adults, or just a couple of words for younger children.
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Once you’ve picked a theme, choose clues that match your students current difficulty level. For younger children, this may be as simple as a question of “What color is the sky?” with an answer of “blue”.
Crosswords are a great exercise for students' problem solving and cognitive abilities. Not only do they need to solve a clue and think of the correct answer, but they also have to consider all of the other words in the crossword to make sure the words fit together.
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