Everything Science Grade 10

(Marvins-Underground-K-12) #1

CHAPTER 4. THE ATOM 4.4


3. Use standard notation to represent the following elements:
a. potassium
b. copper
c. chlorine
4. For the element^3517 Cl, give the number of...
a. protons
b. neutrons
c. electrons
... in the atom.

5. Which of the following atoms has 7 electrons?
a.^52 He
b.^136 C
c.^73 Li
d.^157 N
6. In each of the following cases, give the number or the element symbol
represented by X.
a.^4018 X
b.x 20 Ca
c.^31 xP
7. Complete the following table:

A Z N

(^23592) U
(^23892) U
In these two different forms of uranium...
a. What is thesame?
b. What isdifferent?
More practice video solutions or help at http://www.everythingscience.co.za
(1.) 000m (2.) 000n (3.) 000p (4.) 000q (5.) 000r (6.) 000s (7.) 000t
Chemistry: Matter and Materials 75

Free download pdf