C struct glitch? (I am new to programing in C) - c

Question

I am learning how to create struct's and I am stuck on a program I made. Everything works fine until I try to input "2". When the program prints the symbol it's supposed to be "He" but prints "HeHelium" instead. I can't figure out what's wrong and why it's printing he.symbol and he.name all in one line. Link to image below.
#include <stdio.h>
#include <stdlib.h>
struct Element {
int num;
double mass;
char symbol[2];
char name[20];
};
int main()
{
struct Element h;
h.num = 1;
h.mass = 1.008;
strcpy(h.symbol, "H");
strcpy(h.name, "Hydrogen");
struct Element he;
he.num = 2;
he.mass = 4.0026;
strcpy(he.symbol, "He");
strcpy(he.name, "Helium");
int number;
printf("Please enter the number of the element you want info on. \n");
scanf("%d", &number);
if (number == 1 /*&& !(number > 1)*/) {
printf("Atomic Number: %d \n", h.num);
printf("Atomic Mass: %.3f \n", h.mass);
printf("Atomic Symbol: %s \n", h.symbol);
printf("Atomic Name: %s \n", h.name);
} else if (number == 2) {
printf("Atomic Number: %d \n", he.num);
printf("Atomic Mass: %.3f \n", he.mass);
printf("Atomic Symbol: %s \n", he.symbol);
printf("Atomic Name: %s \n", he.name);
} else {
printf("Invalid number! \n");
printf("Or that element hasn't been added to the date base yet. \n");
printf("Try back later \n");
}
return 0;
}
When I input "2":

Answer 1

You have assigned Element.symbol with only 2byte which can only store string with only one character as the other character will be used for null character. You should write "symbol[3]" as the symbol of elements in periodic table are no longer than 2 characters. Also, your code can become quite messy if you want to assign values for all 118 elements. You can write your code like below:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
struct Elements {
int num;
double mass;
char symbol[3];
char name[20];
};
void print(struct Elements element)
{
printf("Atomic Number: %d \n", element.num);
printf("Atomic Mass: %.3f \n", element.mass);
printf("Atomic Symbol: %s \n", element.symbol);
printf("Atomic Name: %s \n", element.name);
}
void assignElement(struct Elements *givenElement, int num, float mass, char symbol[3],
char name[20])
{
givenElement->num=num;
givenElement->mass=mass;
strcpy(givenElement->symbol,symbol);
strcpy(givenElement->name,name);
}
int main()
{
struct Elements element[119];
assignElement(&element[1], 1, 1.008, "H", "Hydrogen");
assignElement(&element[2], 2, 4.06, "He", "Helium");
assignElement(&element[3], 3, 6.09, "Li", "Lithium");
int number;
printf("Please enter the number of the element you want info on. \n");
scanf("%d", &number);
if (number < 119 && number > 0) {
print(element[number]);
}
else {
printf("Invalid number! \n");
printf("Or that element hasn't been added to the date base yet. \n");
printf("Try back later \n");
}
return 0;
}