The weighted average mass of the isotopes oh that element
Atoms of the same element with the same number of protons but different numbers of neutrons
A type of equation that shows the atomic number and mass number of the particles involved.
A theory based on numerous scientific experiments, that marked the beginning of the development of modern atomic theory
Radiation that is made up of beta particles; is deflected toward a positively charged plate when radiation from a radioactive source is directed between two electrically charged plates
The rays and particles-alpha and beta, and gamma rays-that are emitted by radioactive materials.
Rejected the atomic theory
Discovered that atoms of each element contain a unique positive charge in their nuclei
A high speed electron with a -1 charge that is emitted during radioactive decay
High energy radiation that has no electrical charge and no mass, is not deflected by electric or magnetic fields, usually accompanies alpha and beta radiation and accounts for most of the energy lost during radioactive decay
Verticales
Subatomic particle located in the nucleus of an atom having a +1 charge and has an average mass number of 1
A spontaneous process in which unstable nuclei lose energy bu emitting radiation
Accidentally discovered the cathode ray
The smallest particle of an element that retains all the properties of that element.
The number after an element's name, representing the sum of its protons and neutrons.
Developed the nuclear model of the atom
A reaction that involves a change in the nucleus of an atom
Proposed the Plum Pudding model of the atom
Suggested that matter is composed of empty space through which atoms move.
The process in which some substances spontaneously emit radiation.
A ray of radiation that originates from the cathode and travels to the anode of a cathode ray tube
A particle with two protons and two neutrons with a +2 charge.
A negatively charged subatomic particle with an extremely small mass that is found in all forms of matter and moves through the empty space surround an atom's nucleus
The small, positively charged center of an atom that contains protons and neutrons.
A neutral subatomic particle that is located in the nucleus of an atom and has a average mass number of 1
Determined the charge of the electron
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All your puzzles are accessible from your 'My Puzzles' page, which you can access using the navigation bar at the top when you are logged in.
Be sure to log in using the same email address you used when you created your puzzle.
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There is a 'Make Printable' button on the top left of your puzzle that will let you sign up for a plan or purchase a single puzzle.
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Once you publish your puzzle, you can click the print icon or use your browser’s print function.
It looks weird when printed.
First make sure you’ve published your puzzle. See the 'How do I print?' section above for more information.
99% of other printing issues have to do with printer settings. Instead of trying to fiddle with printer settings, which can be time-consuming and frustrating, there are a couple workarounds you can try.
You can try printing from a different browser, since different browsers have different default print settings. Alternately, you can try saving as a PDF (next to the print icon) and print that.
Why isn’t this free?
We invested in building a number of premium features that free sites are unable to offer: the ability to automatically or manually add words to your puzzle, save-as-you-go puzzle editing, the ability to access your puzzles from any computer, an uncluttered and ad-free interface, the ability for friends and colleagues to solve your puzzles online, and quick responsiveness to reported issues.
My Crossword Maker is the lowest-price service we've found that provides these features, and is designed for people who are not satisfied with what free sites are able to provide.
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We’re sorry you thought My Crossword Maker was free, that must have been frustrating.
We’re constantly trying to provide a clear and straightforward user experience, and we’re not trying to hide the price: on the page where you make your puzzle, the price is listed in the overview in the top left (before you log in), below the 'Make Printable' button (after you log in), in the FAQ below the grid, and also in the tour.
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I am being asked to pay a second time.
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Not all my words are in my puzzle.
When you hit the 'Arrange' button, our algorithm will try to arrange all your words on the grid, and will move words around to try to fit the most words.
This will get all the words on the grid about 90% of the time, depending on the word list. For the other 10%, you will get an alert explaining that the words that did not fit were added to the scratchpad.
It prints on two pages.
Big puzzles won’t always print on one page — the clues and grid are the smallest we could make them while keeping them readable for everyone.
That said, different browsers print in slightly different ways, so you could try using 'print preview' using a different browser (or try the PDF button) to see if you like how that looks better.
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