Science--Help.

Which of the following is NOT one of the eight most common elements in Earth’s continental crust?

carbon
silicon
oxygen
aluminum

The most abundant element in Earth’s continental crust (by weight) is _____.

2.

oxygen
silicon
calcium
iron

3. The central region of an atom is called the _____.

proton
electron
nucleus
neutron

4. If the atomic number of an element is 6 and its mass number is 14, how many neutrons are contained in the nucleus?

6
20
14
8

5. Isotopes of the same element differ in the number of _____.

protons
electrons
neutrons
nuclei

6. When two or more elements bond together in definite proportions, they form a(n) _____.

ion
atom
nucleus
compound

7. What type of chemical bond forms between positive and negative ions?

covalent
metallic
ionic
isotopic

8. What is the smallest particle of a covalent compound that shows the properties of that compound?

an ion
an atom
an element
a molecule

asked by Anonymous
  1. If you will repost and mark your answers with *** I shall be happy to check them. #1 is carbon.

    posted by DrBob222
  2. 1: A
    2: A
    3: C
    4: D
    5: C
    6: D
    7: C
    8: D

    posted by 파크 명동 호
  3. U got all the answers right

    posted by Jerry
  4. I got an 8/8 100% for the answers above thank you.

    posted by Alu

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