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Science

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Across
1.A chemical reaction in which oxygen combines with another compound to form water and CO2 is called a _________ reaction.
4.The 3 elements created out of the Big Bang were hydrogen, helium and ___________.
6.A molecule with a positive or negative charge.
8.The known universe is comprised of matter and ___________.
12.The second most common element in the Earth's crust (27.7%) is ___________.
15.Type of reproduction involving a male and female parent.
16.Conifers are classified as ___________.
19.It is important for seeds to germinate far from the parent plant so they do compete for ___________.
20.Sodium chloride is more commonly known as _______________.
21.A chemical reaction in which new molecules form is called a ___________ reaction.
23.Three forms of sexual reproduction in plants are by spores, flowers, and _________.
24.Pollination of a flower leads to ___________.
25.The periodic table has __________ rows
26.Flowering plants are classified as __________.
29.The double strip of elements listed at the bottom of the periodic table.
30.The science of building machines at the atomic level.
33.The second most abundant metal found in the Earth's crust (5%) is _________.
36.The science of studying behavior of sub-atomic particles.
37.Strawberry plants are an example of _________ reproduction.
38.Animals, water and wind are the main agents of seed ___________.
41.A chemical reaction in which complex molecules are broken down into simpler ones is called a ___________ reaction.
43.Electrons orbit the nucleus in layers known as ________.
45.When a flower pollinates itself it is known as ______________.
46.The number of protons in an element is the same as its _________ number.
47.Particles that transmit electricity by flowing through wires and circuits.
50.Name of the element primarily used in nuclear technology.
51.Electrons that orbit an atom in its outermost orbit are called _________ electrons.
53.Pollen grains contain __________, sex cells critical for fertilization.
54.Gymnosperms do not produce __________.
58.Scientist who discovered the nucleus.
59.The Hindenberg burned because it was filled with pure _________, which will combust in the presence of oxygen and a spark.
61.The most abundant metal (8%) found in the Earth's crust is __________.
65.The horizontal rows are called __________.
67.Type of bond occurring when a non-metal bonds with a non-metal.
69.Particle in the nucleus with a neutral charge.
71.Family of metals known to react violently with water.
73.Atomic number is the number of __________.
75.Pollen grains land on the ___________ of the pistil.
76.Type of reproduction involving only one organism.
77.Mosses, ferns, and liverworts reproduce by means of __________.
78.The male reproductive organ of plants.
79.Once the zygote begins dividing, it develops into a __________.
80.Positively charged particle found in the nucleus.
Down
2.The deepest theoretical organization of matter is known as ____________.
3.The number of neutrons in an element can be calculated by subtracting its atomic number from its atomic _________.
5.Most active non-metals.
7.There are 92 ___________ elements listed on the periodic table.
9.The process of breaking down water into hydrogen and oxygen.
10.The elements are arranged by atomic __________
11.The heavier natural elements of the periodic table (and universe) were formed from __________.
13.Eggs of the ovary are properly known as __________.
14.Family of elements found in second column from the left of the periodic table.
17.Non-metals tend to form __________ ions.
18.When a flower pollinates a different flower it is known as _________.
20.Elements in the middle of the periodic table are the __________ metals.
22.These elements share characteristics of both metals and non-metals.
27.Atoms are comprised of three sub-atomic __________.
28.The 26 man-made elements are known as ___________ elements.
31.Scientist who discovered the neutron.
32.Spermatozoon travel through the pollen __________ to fertilize the ovule.
34.Spermatozoa and ovules are together known as the _________.
35.Scientist who proved the law of conservation of matter.
39.Metals tend to form __________ ions.
40.Family of elements found on the extreme right of the periodic table.
42.Family of elements found on the extreme left of the periodic table.
44.Negatively charged particle that orbits the nucleus.
48.Family of elements found in second column from the right of the periodic table.
49.Scientist who first conceived the periodic table.
52.Inactive gases.
55.Computer chips are made from this element
56.Scientist who discovered the electron.
57.A compound is another name for a __________.
60.Atoms of the same element with a varying number of neutrons are called _________.
62.Most of the elements on the periodic table are classified as __________.
63.In chemistry, the number 6.023 times 10 to the power of 23 is known as a ________.
64.The vertical columns are called families or ___________.
66.Protons and neutrons are made of ____________.
68.The female reproductive organ of plants.
70.The most abundant element in the Earth's crust (46.6%) is ___________.
72.The first fertilized cell is called the __________.
73.The stamen produces __________ grains.
74.Conifers produce __________.

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