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Flashcards in Human Biology Chapter 2 Deck (41)
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1

An atom has an equal number of ____ and _____and is electrically ______

electrons; protons; neutral

2

What has a negative charge?

electron

3

The atomic number of an element is its number of _____

protons

4

The atomic mass of an element is its number of ____

protons and neutrons

5

Isotopes of an element differ from each other by their number of

neutrons

6

An atom has an atomic number of 11 and an atomic mass of 23. How many neutrons in its nucleus?

12 neutrons

7

In an atom the number electrons = the number of ____

protons

8

A chlorine atom with an atomic mass of 35 and am atomic number of 17 possesses ____ protons and ____ neutrons

17; 18

9

Chlorine has 7 electrons in its outermost energy level. To become stable must it lose or gain electrons? How many?

Gain 1

10

Which atom has the greatest atomic mass:
-carbon
-hydrogen
-oxygen
-nitrogen

oxygen

11

An ion is an atom that has ____

gained or lost electrons

12

An atom that has lost one electron is a positive or negative ion?

positive ion

13

a bond formed as a result of sharing of electrons is called a ____ bond

covalent

14

Nitrogen has 5 electrons in its outermost energy shell. How many electrons can it share with outer atoms to become stable?

3

15

Weak bonds that form between polar covalent molecules, such as water, are called ____ bonds

hydrogen

16

a pH of 7.4 possesses more ____ than ____

OH- than H+

17

A pH f 2 is _____ as a pH of 5

1000 times as acidic

18

A chemical that prevents large changes in pH is best called a

buffer

19

Which of the following is an inorganic molecule:
-protein
-lipid
-water
-carbohydrate

water

20

Anything that has mass and occupies space is called

matter

21

The purest substance that contains only one type of atom is called a(n)

element

22

What are found in the nucleus of an atom and has a positive charge?

proton

23

____ from isotopes helps to stabilize their nuclei

radiation

24

atoms contain 3 subatomic particles:

protons; neutrons; electrons

25

the atomic number is equal to the number of

protons

26

atoms of an element that differ by their number of neutrons are called

isotopes

27

an atom that gains or loses an electron or electrons is called a(n)

ion

28

unequal sharing of electrons

polar covalent bond

29

a bond that forms between the charged ends of two water molecules

hydrogen bond

30

the branch of chemistry that deals with carbon compounds is called

organic chemistry