answer What is in a Number?Activity 4.(Adapted from Grade 8 Science Learner's Module)ОВJЕСTIVE:Determine the number of electrons, protons, and neutrons in an atom.DIRECTION: Read the selection carefully then complete the table afterwards.---- ---.-------Elements are given letter symbols including their atomic number and mass.The mass number (A) is written on the upper portion beside the symbol (X), whilei the atomic number (Z) is written below the mass number.X:mass number A+ atomic symbolof elementatomicnumberFigure 1. An atomik symbol with its atomic number and mass.The number of protons in an atom is called the atomic number of anelement. A neutral atom holds an equal number of protons and electrons. TheI atomic number also indicates the number of electrons in that atom. Meanwhile, !the mass number is the sum or the total number of protons and neutrons inI an atom.FTo illustrate further, see the symbol for identifying the fluorineatom. With an atomic number of 9, fluorine has 9 protons. Since the 19number of protons must be the same as the number of electrons, ithas also 9 electrons. How many neutrons does it have? To computefor the number of neutrons, subtract the atomic number from themass number (19-9). Therefore, fluorine has 10 neutrons.Always remember that for a neutral atom,atomic number (Z) = number of electrons = number of protonsmass number (A) = number of protons + number of neutronsnumber of neutrons = mass number (A) – atomic number (Z).Now it is your turn. Determine the number of dectrons, protons, and neutronsby completing the table below. To serve as your guide, the first one is already done foryou.Part 2. Complete the empty cells/boxes in the table.AtomicMassNumber Number(Z)Electrons protons Neutrons(p)ElementElementSymbol(e')(nº)(A)1. SodiumNa11231111122. HydrogenH113. CalciumCa20404. CobaltCo27595. MagnesiumMg1224

Atomic number of an element is equal to the number of protons or the number of electrons present in…

Part 2. Complete the empty cells/boxes in the table. Atomic Number Number Mass Electrons protons Neutrons (p') Element Element Symbol (e') (n이 (Z) (A) 1. Sodium Na 11 23 11 11 12 2. Hydrogen 1 1 3. Calcium Ca 20 40 4. Cobalt Co 27 59 5. Magnesium Mg 12 24

Part 2. Complete the empty cells/boxes in the table. Atomic Number Number Mass Electrons protons Neutrons (p') Element Element Symbol (e') (n이 (Z) (A) 1. Sodium Na 11 23 11 11 12 2. Hydrogen 1 1 3. Calcium Ca 20 40 4. Cobalt Co 27 59 5. Magnesium Mg 12 24

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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What is in a Number?
Activity 4.
(Adapted from Grade 8 Science Learner's Module)
ОВJЕСTIVE:
Determine the number of electrons, protons, and neutrons in an atom.
DIRECTION: Read the selection carefully then complete the table afterwards.
---- ---
.---
----
Elements are given letter symbols including their atomic number and mass.
The mass number (A) is written on the upper portion beside the symbol (X), while
i the atomic number (Z) is written below the mass number.
X:
mass number A
+ atomic symbol
of element
atomic
number
Figure 1. An atomik symbol with its atomic number and mass.
The number of protons in an atom is called the atomic number of an
element. A neutral atom holds an equal number of protons and electrons. The
I atomic number also indicates the number of electrons in that atom. Meanwhile, !
the mass number is the sum or the total number of protons and neutrons in
I an atom.
F
To illustrate further, see the symbol for identifying the fluorine
atom. With an atomic number of 9, fluorine has 9 protons. Since the 19
number of protons must be the same as the number of electrons, it
has also 9 electrons. How many neutrons does it have? To compute
for the number of neutrons, subtract the atomic number from the
mass number (19-9). Therefore, fluorine has 10 neutrons.
Always remember that for a neutral atom,
atomic number (Z) = number of electrons = number of protons
mass number (A) = number of protons + number of neutrons
number of neutrons = mass number (A) – atomic number (Z).
Now it is your turn. Determine the number of dectrons, protons, and neutrons
by completing the table below. To serve as your guide, the first one is already done for
you.
Part 2. Complete the empty cells/boxes in the table.
Atomic
Mass
Number Number
(Z)
Electrons protons Neutrons
(p)
Element
Element
Symbol
(e')
(nº)
(A)
1. Sodium
Na
11
23
11
11
12
2. Hydrogen
H
1
1
3. Calcium
Ca
20
40
4. Cobalt
Co
27
59
5. Magnesium
Mg
12
24

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